You are here:
| Subject | Date Asked |
| Burnt Resistor - Followup | 1/27/2012 |
| Q: I'm trying to repair a small lamp that has a burnt resistor. Unfortunately, the color codes all ... A: The electronics you describe are a "three way touch light switch circuit" and it allows the touching ... | |
| Burnt Resistor | 1/26/2012 |
| Q: I'm trying to repair a small lamp that has a burnt resistor. Unfortunately, the color codes all ... A: Usually the specifications for the lamp/bulb are found on one of the web sites. ... | |
| Building a Equivalent Circuit Model for a UWB Antenna | 1/23/2012 |
| Q: First of all, i would like to apologize if i annoy you with this question. Actually, i have designed ... A: Here is a little tutorial on the UWB antenna options: ... | |
| measurements | 1/16/2012 |
| Q: HYi Cleggsan, Thanks for your prompt reply. Sorry, my question was about measurements. I mean am EM ... A: If you read my links you learned that the measurement technology is quite different between the two ... | |
| EM field | 1/15/2012 |
| Q: Electric Field ...E (V/m ) Magnetic Field B (Wb/m^2) or in CGS Gauss/m^2. My question is that why ... A: Is this a question about measuring technique, test equipment or theory? See this: ... | |
| laplace equation | 12/30/2011 |
| Q: how do i convert this into F(S) f(t)=e^-2t(t^2-sin(4t))u(t) i solve it and i got this for my ... A: This looks like a home work problem.... We like to help without actually solving it for you. ... | |
| electrical and electronic | 12/23/2011 |
| Q: !! I'm final year student from vtu university . please give an topics for a project and details ... A: Well, let me make some comments and then ask you some questions. By now you should have some ... | |
| Instantly start video recording when required for small area of the CMOS sensor possible? | 12/6/2011 |
| Q: Apologies if the below doesn't fall exactly in the area you are most expert in: I am working on my ... A: The problem is not in the camera element. They are fast as they must build a complete frame or ... | |
| microwave | 12/6/2011 |
| Q: Greetings! Radio transmission is microwaves ...transmitter sending MW to receiver,inducing voltage ... A: First, "Radio transmission is microwaves" is not a true statement. Please read the following about ... | |
| electrical capability | 12/4/2011 |
| Q: is it possible to send a strong pulse of electricity into soil or clay over a distance of several ... A: Sorry, I do not know what you mean by the word "sompone". It is not a term I am familiar with. ... | |
| earth leakage current CB | 11/13/2011 |
| Q: I just had my house's earth leakage cb trip, there is heavy lighting nearby. Why does it trip when ... A: Lightning near by can create imbalance in the feed lines to your residence. This imbalance can ... | |
| blinking 120 neon light | 11/4/2011 |
| Q: I have a small (mini) neon light from Radio Shack that runs on 120 volts that I would like to make ... A: Christmas tree blink bulbs are heat sensitive breaker design. There is an internal heater element ... | |
| blinking 120 neon light | 11/4/2011 |
| Q: I have a small (mini) neon light from Radio Shack that runs on 120 volts that I would like to make ... A: There are neon lights that are used for Christmas tree strings that have blinker built into the ... | |
| Electric power and machines | 10/6/2011 |
| Q: what are the characteristics of direct current generator interms of speed and torque A: Read these pages: http://cindulkar.tripod.com/lab32.pdf ... | |
| Shunt in a DC circuit | 9/29/2011 |
| Q: A follow up to the previous shuntHow do you determine the polarity of a shunt when hooking up the ... A: Had I known you were working in the government/military environment it would have been easy to ... | |
| Necessity of mag.poles | 9/27/2011 |
| Q: Sir, this is a basic question and heard explanation for it from various lecturers,but couldnt ... A: See the discussion of synchronous speeds in this page: http://en.wikipedia.org/wiki/Alternator ... | |
| How to replace a battery with a plugged in connection | 9/26/2011 |
| Q: I have a DC 12v 7ah lead acid battery driven lawn mower. The battery died. And according to the ... A: The supplies from Grainger are merely 120vac to dc converters at different current capacities. The ... | |
| How to replace a battery with a plugged in connection | 9/26/2011 |
| Q: I have a DC 12v 7ah lead acid battery driven lawn mower. The battery died. And according to the ... A: You need a pretty constant output - more than a simple diode rectifier will supply. The most ... | |
| Shunt in a DC circuit | 9/23/2011 |
| Q: A follow up to the previous shuntHow do you determine the polarity of a shunt when hooking up the ... A: That helps greatly to learn the situation! So, do I understand correctly the shunt is prewired and ... | |
| Shunt in a DC circuit | 9/23/2011 |
| Q: A follow up to the previous shuntHow do you determine the polarity of a shunt when hooking up the ... A: Can you not use an external voltmeter connected across the shunt to measure polarity? If you know ... | |
| Earth/Neutral | 9/13/2011 |
| Q: 1.For a UPS system with neutral connected to the main earth neutral,any fault at the main neutral ... A: Sorry, I do not know about UPS grounding troubleshooting. It is not something I have experienced (I ... | |
| Twisted pair cable question | 9/11/2011 |
| Q: Why is that in twisted pair cable, the tighter the twisting, the higher the supported transmission ... A: Tighter twisting of a pair of wires increases its shielding from outside and stray electric or ... | |
| tsunami | 9/10/2011 |
| Q: I have a question that is kinda like a phenomena in solid state devices where at the quantum level ... A: Yes, and no. The wave theory you explained is very sensible and in keeping with basic wave ideas. ... | |
| washing machine | 9/10/2011 |
| Q: First let me say that I really enjoy reading your responses,its really brilliant.I studied ... A: Sounds like double talk to me. There should be no "shocking" whatsoever with household appliances. ... | |
| Power factor | 9/10/2011 |
| Q: What is power factor in simple mean and how we can improved this? A: Power factor is a measure of how much out of phase the current and voltage are to each other. If ... | |
| harmonic filters | 9/10/2011 |
| Q: So thy unwanted harmonics are shunted to earth where they return to the source..is'nt that bad.I ... A: Think of it more as blocking the harmonic currents. Only the small portion that does not get fully ... | |
| harmonic filters | 9/9/2011 |
| Q: I have been reading up on power system harmonic filtering and it says that the harmonic currents are ... A: The harmonics are filtered from getting through to the load, but the filter shunts them to the ... | |
| dc-dc converter queries | 8/25/2011 |
| Q: I am designing buck converter. in theory i have read that if i use 'schotky diode' i will notice an ... A: There are many implementations/circuits for a buck converter and since I don't have the schematic ... | |
| electric shock | 8/22/2011 |
| Q: sir, I purchased front loading washing 3 months back.(the make is Seimens). Recently i noticed that ... A: If there is excessive voltage between the metal chassis parts of the appliance and ground then you ... | |
| Pioneer SA-5300 DC offset | 8/20/2011 |
| Q: I have a working pioneer sa-5300 amplifier which I repaired a few years ago. I notice that the ... A: I don't think the offset of the cone would be great enough to even measure with the 25mv. And, with ... | |
| Pioneer SA-5300 DC offset | 8/20/2011 |
| Q: I have a working pioneer sa-5300 amplifier which I repaired a few years ago. I notice that the ... A: Direct coupling is for good low frequency response. And, while it eliminates the bulky coupling ... | |
| dot and cross products | 8/16/2011 |
| Q: this is a question based from Electromagnets and its basic. I have two questions.I have (A.B).(C.D) ... A: You are correct in terms of scaler dot scaler as it is defined. Please excuse me on this as I am an ... | |
| dot and cross products | 8/16/2011 |
| Q: this is a question based from Electromagnets and its basic. I have two questions.I have (A.B).(C.D) ... A: A scaler times a vector is a vector. Vectors have angles, of course, scalers donot. So, the ... | |
| Measuring a regulated power supply | 8/16/2011 |
| Q: I have a power supply that is suppose to be 48 volts at 3 amps but when I hook the power supply ... A: Yes, of course. The whole idea of voltage and current is power out. If the rating is 48 volts @ 3 ... | |
| transformer | 8/11/2011 |
| Q: what is the effect of form factor in transformer? A: Your question is too broad because there are so many transformer types, sizes, materials, windings, ... | |
| Harmonics filter out | 8/9/2011 |
| Q: Why is it difficult to filter out the lower order harmonic current? ANSWER: Think about it. ... A: Basically the same. The lower order harmonics are closer in frequency to the center frequency and ... | |
| Power Quality - Transformers | 8/8/2011 |
| Q: What affect, if any, does a step-up or step-down transformer have on power factor? ANSWER: The ... A: Yes, in your situation, and with most power distribution systems the power factor improvements must ... | |
| Harmonics filter out | 8/8/2011 |
| Q: Why is it difficult to filter out the lower order harmonic current? A: Think about it. Harmonics are related to multiples of the frequency. For a 1khz signal the next ... | |
| Power Quality - Transformers | 8/8/2011 |
| Q: What affect, if any, does a step-up or step-down transformer have on power factor? A: The transformer itself, especially as the design approaches ideal characteristics, is very little ... | |
| Electrical Engineering(Power) | 8/8/2011 |
| Q: I am a final year student of electrical engineering at UET Pakistan and humbly request your ... A: I get this request often. Best place to start is a) your own personal interests and b) your ... | |
| Electrical Engineering(Power) | 8/7/2011 |
| Q: I am a final year student of electrical engineering at UET Pakistan and humbly request your ... A: I get this question frequently from around the world. You can search through the archives of my ... | |
| scope for DSP | 8/4/2011 |
| Q: Considering doing an MS in DSP, what do you think is the scope for DSP engineers? What kind of jobs ... A: For course work you should go to the web sites of a few universities offering these type courses and ... | |
| scope for DSP | 8/4/2011 |
| Q: Considering doing an MS in DSP, what do you think is the scope for DSP engineers? What kind of jobs ... A: Any field in EE is good. There are many opportunities in all fields. You really should follow your ... | |
| high voltage | 8/2/2011 |
| Q: Hey Cleggsan, Below is a youtube site on Physics.In the segment on electricity they passed 6000v ... A: The soda can is forced out of the coil due to the very large current which was made when the ... | |
| Need your guidance | 8/2/2011 |
| Q: My sister is passed this year with 87 % in electrical engineering diploma. She is very brilliant in ... A: Autocad is a wonderful career path. And, furthering the school effort to obtain a higher degree is ... | |
| Synchronous motor failure to start on no load | 8/1/2011 |
| Q: We have a 13.8KV, 20323HP Synchronous motor which we received from the mechanical shop. While ... A: Sorry, I have no idea. It is possible the rotor coils have a short in them somewhere. I suggest you ... | |
| Electricals | 7/31/2011 |
| Q: I need a book that teaches basic electricals, and tells about proofs for all formulae. Telling about ... A: There are so many. Have you checked the text books from your school where you are studying. That is ... | |
| generators | 7/27/2011 |
| Q: Its me again..this time with a question on power generators.I have heard it said that when a power ... A: Sorry, I do not know this matter; it is outside of my experience range. But, I am listing some ... | |
| transformer | 7/25/2011 |
| Q: Hey cleggsan, I just read your response on transformer.I by chance on this website about a flash ... A: Flash over or arcing takes many forms and can be very low in energy - which may be too low to excite ... | |
| Microprocessor, and controller | 7/21/2011 |
| Q: I'm a non-traditional student with a broken treadmill. It seems as though one of the four workout ... A: The speed of the motor driving the treadmill belt is controlled by the field current which is, in ... | |
| Transformer grounding | 7/21/2011 |
| Q: Good Morning Cleggsan, I have a question regarding the grounding of a Marcus MT112.5A1 Transformer. ... A: I would say you are getting internal arcing between the windings and the case of the transformer. ... | |
| Direction of AC current at negative half cycle. | 7/16/2011 |
| Q: I am as confused in this concept as much i could. Actually experts say that current flows from ... A: The generator reversed direction and send the current in the opposite direction. That is what ac is ... | |
| Microwave | 7/16/2011 |
| Q: Hey Cleggsan The screen perforations in the front of a microwave oven is of a certain size and ... A: Good question. See here: http://www.howeverythingworks.org/page1.php?QNum=1527 and here: ... | |
| Direction of AC current at negative half cycle. | 7/15/2011 |
| Q: I am as confused in this concept as much i could. Actually experts say that current flows from ... A: Yes, electricity travel from positive to negative in DC circuits. It is not movement of electrons as ... | |
| Microwave | 7/15/2011 |
| Q: Hey Cleggsan The screen perforations in the front of a microwave oven is of a certain size and ... A: Yes, you are right. The screen acts as a stopgate for the wavelengths of the microwave frequency. ... | |
| Power frequency | 7/14/2011 |
| Q: My house is near from a HV power line and I wonder how well concrete and glass "blocks" absorbs and ... A: Yes, wavelength at 60 Hz is very long. In fact, the wavelength is more than 3,000 miles. The ... | |
| Power storage | 7/6/2011 |
| Q: I have heard that DC can be stored easily like in batteries but its tough to store AC..Is it true ... A: As previously, AC power cannot be stored in its alternating form. It must be rectified and ... | |
| Power storage | 7/6/2011 |
| Q: I have heard that DC can be stored easily like in batteries but its tough to store AC..Is it true ... A: DC storage in batteries is a very common method of preserving electrical energy for later retrieval ... | |
| Electricity Transmission | 7/5/2011 |
| Q: Sir, I just want to know that in countries like India electricity is supplied to homes at 230volts ... A: Oh, they do in many countries and where very long lines are needed. In fact the system design ... | |
| Phase | 7/4/2011 |
| Q: please tell me y don't v use 2-phase or 4-phase electrical power.Why we only use 1,3-phase power.Why ... A: Yes, there are many multi-phase schemes to transfer power. The settlement on 3-phase is merely ... | |
| Electricity Transmission | 7/4/2011 |
| Q: Sir, I just want to know that in countries like India electricity is supplied to homes at 230volts ... A: Electric generation plants produce their power at many different voltage levels for a variety of ... | |
| how/where to build or buy a flashing light circuit | 6/29/2011 |
| Q: I need to have a light flash 3 to 5 times (adjustable) and then stay constant on. How would I design ... A: Are you familiar with the 555 timer? They are very, very common and are used in many switching and ... | |
| Radio | 6/26/2011 |
| Q: I read that several people contributed to the invention and there are contentions on who actually ... A: From the USA National Public Radio organization they say: The Origin Of The Word 'Radio' — ... | |
| how/where to build or buy a flashing light circuit | 6/24/2011 |
| Q: I need to have a light flash 3 to 5 times (adjustable) and then stay constant on. How would I design ... A: Sorry for the delay; been out of town. ... | |
| calculating power use to see how long battery lasts | 6/20/2011 |
| Q: Konichiwa Cleggsan! Hisashiburi desu! Genki? I have a question today about how to calculate the ... A: Ohaiyo Gozaimashita! If you multiply 50 microamps times .5 seconds it gives 25 microamp.seconds. ... | |
| Battery capacity | 6/17/2011 |
| Q: What's the latest uppermost limit capacity for rechargeable batteries nowadays in terms of the AA ... A: Good question. First, take a scan through this blog: ... | |
| Frequency Converter | 6/13/2011 |
| Q: I have read about a product that can convert vertical motion back into electrical energy and feed it ... A: Sorry, I have not heard of such a device. If you are thinking that it can become a perpetual motion ... | |
| Overload protection for 30 W | 6/12/2011 |
| Q: We are a small company engaged in rural electrification. Our consumers consume powers in the range ... A: An automatic sensing circuit around a semiconductor based detector would cost many times that of a ... | |
| electricity | 6/10/2011 |
| Q: I'm not sure if I've got the right category... not sure whom to ask! But let's give it a go... I'm ... A: Any apparatus that requires electricity to operate any component or function within the apparatus ... | |
| Overload protection for 30 W | 6/10/2011 |
| Q: We are a small company engaged in rural electrification. Our consumers consume powers in the range ... A: That is a very small amount of power. Cost must surely be a major concern as well is it not? I ... | |
| Power Lines | 6/6/2011 |
| Q: If there is snow built up on a power line and the line breaks, is it the power company's fault if ... A: Sorry, I am not an attorney so I cannot give you a reliable answer on the line breakage question. It ... | |
| What do I need to make my US appliances work in South Africa? | 5/23/2011 |
| Q: I have relocated to South Africa from the USA. I brought with me my laptop, my printer, my ... A: The power system in countries throughout the world are shown here: ... | |
| Infrared Light | 5/20/2011 |
| Q: I have a solar powered walk light with a 1.2 volt battery and a 1.2 volt LED. I tried to change the ... A: Good; you are clever. How is the solar light powering it? Direct? Or off a battery which is ... | |
| auto | 5/19/2011 |
| Q: can u help with electric problem on a 1992 cadillac deville? A: So, what's the problem? Here are some ideas for you: ... | |
| ELCB | 5/16/2011 |
| Q: Every time there is lightning activity near my house my earth leakage circuit breaker trips.I know ... A: You did not give much information to go on but here is my guess. An imbalance in the transformer ... | |
| transformer | 5/13/2011 |
| Q: OLU,ODVL,HFU stand for what? i am a civil engineer but i need to do something on electrical,help me ... A: They are oil filled transformers and switchgear used in high current distribution systems, mostly. ... | |
| capacitors | 5/8/2011 |
| Q: if i touch one terminal of a charged capacitor ,either +or - and i am standing inbare feet on the ... A: Touching both terminals of the cap by different parts of the body will produce a shock (if the ... | |
| 220v vs 12v household lighting | 5/3/2011 |
| Q: I have read your answer to a question about whether a 15W globe will be more efficient running ... A: Sorry, I donot remember the question you refer to. In self/DIY installations I recommend low ... | |
| same again | 5/1/2011 |
| Q: When you see the power rating for the Air con furnace and the Tumble dryer a 220 volt supply is ... A: Well, in England the wiring it different. They use a different voltage, different frequency and ... | |
| "240 and 110 requirements | 5/1/2011 |
| Q: When you see the power rating for the Air con furnace and the Tumble dryer a 220 volt supply is ... A: Most home/residential services are fed with a 220v single phase (from a 3 phase distribution further ... | |
| transformer raiting | 4/26/2011 |
| Q: i want to know about the rating of transformer. i want to make a project on lvdt. the voltage rating ... A: You did not give me enough information to provide ratings detail. There are many types of LVDT ... | |
| Garbage disposal outlet | 4/22/2011 |
| Q: I am a first time do it yourselfer. I am trying to re-hook up an outlet underneath the sink for ... A: You could google for house wiring color codes. Here is one answer, for example: ... | |
| cell phone | 4/3/2011 |
| Q: I managed to use my cell phone in a lift.I thought that lift cages being made of metal acts like a ... A: Check with your cell service provider; in many buildings they have transmitter systems built into ... | |
| Copper on a PCB with a uniform thickness | 4/1/2011 |
| Q: How are you? I have a rather obscure question today. I want to build a multi layer PCB and I need to ... A: Genki Des. You really get around. The usual procedure it so deposit the copper onto the board 100% ... | |
| Radio frequency | 3/29/2011 |
| Q: The F.M. frequency band extends from 88 Megahertz to 108 Megahertz. A) If each radio station has a ... A: A) Interestingly there are many broadcasters in the USA. Each frequency assignment may have several ... | |
| how to connect the seven segment | 3/24/2011 |
| Q: ..i dnt have idea to connect the 7 segment...can i know the connection from the microcontroller ... A: Sorry, I don't recall the original question and what you are doing.... Is this a similar circuit ... | |
| Substrate and copper film thicknesses | 3/24/2011 |
| Q: Genki? All your friends in Japan ok? I am currently talking to some companies, looking to get a ... A: Sorry, don't know. I am not an expert in board fabrication techniques. I suspect it is somewhat ... | |
| EM Shielding | 3/19/2011 |
| Q: There is usually a shielding wire mesh around data/signal cables.In the case of a lightning strike ... A: Electric fields from lightning are easily shielded by the braided mesh wire around the conductor in ... | |
| traffic light project | 3/18/2011 |
| Q: I'm doing a project traffic light which can detect if have faulty.I use ATmega32 to create the ... A: My comments previously were only suggestions on how to interface with your circuit. I did not know ... | |
| doing a project in traffic light | 3/16/2011 |
| Q: I'm doing a project traffic light which can detect if have faulty.I use ATmega32 to create the ... A: You should add output from each transistor that will combine in separate register to give signal to ... | |
| Engineer career | 3/8/2011 |
| Q: I am 23 year old male.My nationality is Indian.Curently i lived in United States. I am Green Card ... A: Finding employment in USA for engineers with some experiences and BSEE is very easy. There are ... | |
| Electronic driver and software | 3/7/2011 |
| Q: How are you? Genki desu ka? Thanks for all your recent advice about using hybrid circuit transistor ... A: A 555 is good where you need a timing function. http://www.555-timer-circuits.com/ The above is a ... | |
| charges | 3/2/2011 |
| Q: Yes I do agree that on the outside all charges distribute themselves evenly in a prefect conductor.I ... A: The inside charges have all been oriented outward because, like water, the seek the lowest energy ... | |
| charges | 3/1/2011 |
| Q: I read that Faraday once used a flexible conducting material and fashioned it into the shape of a ... A: Attraction and repulsion from the charges on the surface of the net materials, I would say. Charges ... | |
| Magnetic moment | 2/28/2011 |
| Q: I have visited the site you recommended and found it very informative...as a follow up ... A: It is not clear that anyone knows the answer to this question clearly. Also, it depends on which ... | |
| induction | 2/27/2011 |
| Q: Radio/microwaves are EM waves that propagate through space and can induce signals in a receiving ... A: Study about quantum theory and you will find that light is thought of as both a wave and a particle. ... | |
| wiring multiple electromagnets into the same circuit | 2/25/2011 |
| Q: I hope you are Genki. I am working on a design I would like to ask your opinion about (again) I ... A: Most of these kinds of fab houses are located in Singapore, Hong Kong, China and Korea. Japan has ... | |
| motor vehiclel electronics | 2/24/2011 |
| Q: hi im a student and im currently doing motor vehicle electronics as part of my course i was ... A: Normally, we think of electricity as that associated with power distribution to operate the ... | |
| wiring multiple electromagnets into the same circuit | 2/22/2011 |
| Q: I hope you are Genki. I am working on a design I would like to ask your opinion about (again) I ... A: It depends on the transistor and the circuitry as to how much current you will be able to dump into ... | |
| wiring multiple electromagnets into the same circuit | 2/21/2011 |
| Q: I hope you are Genki. I am working on a design I would like to ask your opinion about (again) I ... A: Yes, the matrix grid works well with low currents, low voltages and relatively high frequency switch ... | |
| clock runs backwards | 2/20/2011 |
| Q: Not sure if this falls under your expertise or not... I have an old electric clock that ... A: It is most likely a bad start capacitor; a small electrical component that keeps the angle of the ... | |
| Multiple transistors from the same power source? | 2/18/2011 |
| Q: I have been researching transistors and found the diagram of a bipolar transistor shown in the image ... A: If metal strips or bars are touching or connected it is essentially zero resistance. When the ... | |
| Multiple transistors from the same power source? | 2/14/2011 |
| Q: I have been researching transistors and found the diagram of a bipolar transistor shown in the image ... A: Yes, you may. You have my permission! In the circuit you have shown it is simply redundant. The ... | |
| Transistors as switches to control current on a PCB | 2/9/2011 |
| Q: This is Eddie again, domo domo. I have another ignorant question to ask if I may. This one is about ... A: Transistors are what we call discrete devices. They must be connected to individual "wired" ... | |
| watts/volts on adapters | 2/7/2011 |
| Q: I'm not sure if you are the person to ask but.... I have a digital piano with a lost cord. The back ... A: The ratings on the cord are not so important; they are just the maximum service that it can support. ... | |
| antenna | 2/7/2011 |
| Q: Why is the transmitting and receiving antenna set at 1/2 the wave length of the transmitted wave A: Well, they can be any length, but to optimize their ratio of signal gain it is helpful to be a ... | |
| 12 volt house wiring | 2/5/2011 |
| Q: We are experimenting with wiring a 12 volt system of a few lights throughout our house as a backup ... A: Are you running DC or AC? It makes a big difference. If you are getting too much voltage drop it ... | |
| Ceiling fan | 2/2/2011 |
| Q: sir,can u please tell me the use of capacitor(condensor) in a ceiling fan. Thank You A: This is an often asked question. Here is a good answer (among many that you can find with a google ... | |
| Maximum current through a wire | 1/26/2011 |
| Q: I was forced to start a new question but I am still working on the maximum current my the copper ... A: Length of the wire? Termination? (How is the wire snubbed or soldered to its circuit?) Wire is ... | |
| Maximum current through a wire | 1/25/2011 |
| Q: I have a question about the maximum amount of current that a wire can take. If I enclose a wire in ... A: There are guidelines on current capacity but they are based on experimental and safety issues. See ... | |
| service meter accuracy | 1/25/2011 |
| Q: I have a WVO/WMO engine that spins an induction generator that is net metered to my house power ... A: The terms are very critical here. Your text says KW which is real power - which is a different ... | |
| Maximum current through a wire | 1/23/2011 |
| Q: I have a question about the maximum amount of current that a wire can take. If I enclose a wire in ... A: No, it is a matter of conductivity. No conventional coating material has a negative heat transfer ... | |
| Stereo power consumption | 1/22/2011 |
| Q: I have a Sherwood 100Wx2 stereo .It is rated at 120VAC , 2Amps. I measure about 20 Watts consumed at ... A: No, what you measured it probably close to reality. Was there no audio being produced at the time? ... | |
| Maximum current through a wire | 1/21/2011 |
| Q: I have a question about the maximum amount of current that a wire can take. If I enclose a wire in ... A: Well, it is an ohms law question. Current passing through a wire produces heat. The amount of heat ... | |
| Anisotropic Etching | 1/15/2011 |
| Q: Konnichiwa Cleggsan, Genki desu ka? Thank you for all your previous help with my various questions. ... A: Genki Des. Sorry, been away for a few days. The angle for the anisotropic etching is specific for ... | |
| converting 230 to 110 | 1/8/2011 |
| Q: i purchased a meet slicer for 6.00 at a goodwill store and did not realize that the plug end was a ... A: Probably ok. You can buy plug converters just about anywhere and a transformer to change the ... | |
| projects | 1/7/2011 |
| Q: How to improve the electrical projects in India? what are the company requirements from ... A: PROJECT: You must study this by yourself. Do some research on the topic, the purpose, the ... | |
| asking about summer training | 1/5/2011 |
| Q: now i am studing in my 3rd yr and i want to know in which company i should take my summer training ... A: Here are some ideas: http://indiafocus.indiainfo.com/companies/ ... | |
| can an unbalance in current cause high bills | 12/30/2010 |
| Q: with single phase A AC current #amps#, what will happen if there is an unbalance in amps of 51 amps ... A: Somehow I am not understanding your question. We don't normally speak of a single phase line having ... | |
| steam and gas turbine power plant | 12/22/2010 |
| Q: What is steam and gas turbine power plant? A: Not sure I understand your question. Maybe you are thinking of the very efficient type of generator ... | |
| Amp's Volt and Draw | 12/20/2010 |
| Q: In terms of how amps work in a circuit, does a circuit only draw the required amps from a power ... A: Do you know ohm's law? It says that Voltage = Current X Resistance. In a pc the current draw ... | |
| rice cooker | 12/14/2010 |
| Q: My imarflex rice cooker model: IRC-780N did not automatically shut-off, even the rice is already ... A: The temperature and/or timer circuit inside the time is probably defective. You should return it to ... | |
| asking how to model a pv inverter | 12/11/2010 |
| Q: i am an engineering student writing a thesis . My topic is to modeling a pv photovoltaic inverter in ... A: Here is a technical paper on inverters used connection of solar power to the grid. ... | |
| power electronic | 12/6/2010 |
| Q: WATS the future growth of electronic field? A proper definitions for power electronic ? A: Big. Power electronics is here to stay. Technology for improvements in generation, distribution, ... | |
| Sony bravia red blinking light | 12/3/2010 |
| Q: Model sony bravia kdl26s2020.bought july 2006 Normal last night. Turned off at the wall. Today it ... A: Sony uses a diagnostic blinking code scheme. Depending on the number of blinks - you must count them ... | |
| Copper etching and conductivity | 12/1/2010 |
| Q: I am interested in etching copper to create a printed circuit board. I want to use a ... A: Eddie, Hello, again. Ohaiyo gozaimashita! I have not done etching for so long that I really don't ... | |
| Hydroelectricity | 11/18/2010 |
| Q: I am in fifth grade and I want to make a simple hydroelectric generator A: Do you know how a generator works? If you donot, go to: ... | |
| Hydroelectricity | 11/18/2010 |
| Q: I am in fifth grade and I want to make a simple hydroelectric generator A: Do you know how a generator works? If you donot, go to: ... | |
| automatic voltage regulator | 11/17/2010 |
| Q: Can you spare me a full circuit diagram of automatic voltage regulator of 520 kW generator A: That's out of my direct field. Actually, I am mostly an electronics engineer and have only basic ... | |
| ct meter | 11/16/2010 |
| Q: what is the process of calculation of electricity thru CT Meter. A: Have you studied the basic, tutorial level writings on this subject? See here: ... | |
| diodes | 11/15/2010 |
| Q: i have a diode that i can't find replacement for, can you tell me if i can replace it with another ... A: It would have been better if you were to tell the circuit that it is going into. The critical ... | |
| Power factor | 11/14/2010 |
| Q: An industrial complex installed with a generator is working at its maximum kVA capacity with a ... A: I am not an expert in this kind of calculation. However, it is desireable, in my view, to have some ... | |
| HF help | 11/13/2010 |
| Q: I am just starting out in shortwave and went to wikapedia.com for help. I know when the Ionosphere ... A: It will depend on so many other factors such as diameter of the dipole, its orientation from the ... | |
| HF help | 11/13/2010 |
| Q: I am just starting out in shortwave and went to wikapedia.com for help. I know when the Ionosphere ... A: The charge layers move around (altitude) during night and day and are frequency dependent to a great ... | |
| 600V inrush current | 11/12/2010 |
| Q: I purchased a steam cleaner with a 1.5 hp 600V motor and a 17Kw 600V electric heater. The rated ... A: Current for the heater is: P = V*I, I = P/V = 17,000/600 = 28.33A Current (Steady State) for the ... | |
| Volts, Amps, Watts and Ohms | 11/5/2010 |
| Q: Hey there, I'm trying to clean up my understanding of electricity, starting with DC currents. I've ... A: ONE: [a]. voltage is attraction. It is how much electrons want to move. No, voltage is the measure ... | |
| Fan/light generator | 11/4/2010 |
| Q: Cleggsan, If I take a typical house ceiling fan/light and mount it vertically outside so it turns in ... A: Did you try it? It should be a simple matter to just put a voltmeter on the terminals of the fan ... | |
| Voltage Regulator? Resistor? Automotive LED Help! | 11/3/2010 |
| Q: I'm trying to put an LED light in place of a regular halogen bulb in my car (factory accent ... A: Suggest you use a 2 amp diode in series with this lamp. Also, you must make sure it is properly ... | |
| Input waveforms for SMPS | 10/23/2010 |
| Q: I have two questions. 1. I own a Huntkey V-power 450 W power supply.what are the supported ... A: You should look at the output of the UPS on a scope. Then you can assess how it looks. In my ... | |
| Input waveforms for SMPS | 10/23/2010 |
| Q: I have two questions. 1. I own a Huntkey V-power 450 W power supply.what are the supported ... A: ANSWER 1: It will function best with a true sine-wave input. If it is not a sine wave with low ... | |
| power transformer | 10/18/2010 |
| Q: in the power transformer protection, only 2nd harmonic and 5th harmonic current are considering ... A: It really depends on how the transformer is used and loaded. Especially, when the transformer is ... | |
| Required UPS watt | 10/12/2010 |
| Q: HOw much watt or VA ups should i buy for my computer with min backup time of atleast 10-15 min.. My ... A: Yes, that is correct. That is why I suggest some overhead or "at least" the amount calculated. The ... | |
| Generator. | 10/12/2010 |
| Q: I am trying to build a bicycle-powered generator that is capable of generating enough power to run a ... A: You will find it exceedingly difficult to do this without a battery in the system. Why? Because ... | |
| Required UPS watt | 10/11/2010 |
| Q: HOw much watt or VA ups should i buy for my computer with min backup time of atleast 10-15 min.. My ... A: Your power supply is rated at 350w and can handle peak of 450w. That means that if you want to keep ... | |
| Required UPS watt | 10/11/2010 |
| Q: HOw much watt or VA ups should i buy for my computer with min backup time of atleast 10-15 min.. My ... A: You need to know the power consumption rating of the power supply you are using. Most are around 300 ... | |
| Do rice cookers have electronic circuitry? | 10/9/2010 |
| Q: I recently bought a rice cooker in japan but now I live in the uk. I bought a transformer ... A: Your rice cooker will work with a transformer type converter. It will probably NOT work with the ... | |
| Do rice cookers have electronic circuitry? | 10/9/2010 |
| Q: I recently bought a rice cooker in japan but now I live in the uk. I bought a transformer ... A: Without the make and model number it is hard to say. Have you checked the owners manual? Some of ... | |
| DAC | 10/8/2010 |
| Q: I am constructing Digital to analog converter using R-2R ladder and Op-AMp. howmuch voltage i have ... A: Here is a simple design idea for R2R ladder system. ... | |
| How much metal has to be present for a magnet to attract it? | 10/7/2010 |
| Q: I have a question about magnetic attraction. I have a design that uses an electromagnet to attract a ... A: The force generated to "pull" the embedded object will depend on the concentration level of the iron ... | |
| dc motor | 10/7/2010 |
| Q: calculate the torque in N-m,developed by a dc motor having an armature resistance of 0.25 ohm and ... A: Here: http://www.elec-toolbox.com/Formulas/Motor/mtrform.htm ... | |
| MV Terminations | 10/6/2010 |
| Q: Can you tell me satandard procedures for MV shielded cable terminations what the rules are to strip ... A: Read these: ... | |
| series | 10/5/2010 |
| Q: why we observe that there is some brightness difference between two different power bulbs while ... A: If bulbs are not identical in every way when connected in series they will each have a different ... | |
| electric shock | 10/2/2010 |
| Q: sir , my doubt is the electric shock tends to get for a high resistance human being or a low ... A: This is a very complicated matter. It is true each human person has a different conductivity and ... | |
| sir.... | 10/1/2010 |
| Q: why generally the voltage ratings of substations will be 1.1kv,3.3kv,33kv .... why cant they be ... A: It is somewhat just tradition or convention. It started in the early days with convenience in ... | |
| bidirectional DC-DC converter | 9/26/2010 |
| Q: what is bidirectional DC-DC converter and how does it work.thanks....waiting for ur replyyyy A: There are a few ideas about what this is and how they work.... different engineers have their own ... | |
| Electrical Engineering | 9/26/2010 |
| Q: Please please help me 2) If the amplitude of a sinusoidal current waveform in a 30mH inductor, ... A: XL, Inductive reactance = 2 times pi times f times L = 2(3.14)(2000)(30mh) = j372 ohms doesn't it? ... | |
| Electrical Engineering | 9/25/2010 |
| Q: Please please help me 2) If the amplitude of a sinusoidal current waveform in a 30mH inductor, ... A: We don't do homework problems here but we can guide you along the way so you can figure it out for ... | |
| voltage spikes/outages | 9/24/2010 |
| Q: Are flat screen televisions susceptible to damage from hard shut off during power outage? Should a ... A: Surge suppressors are a waste of money. They are mostly marketing hype - at least the consumer ... | |
| voltage spikes/outages | 9/24/2010 |
| Q: Are flat screen televisions susceptible to damage from hard shut off during power outage? Should a ... A: If you overload the ups it will go into overload and probably shut down. You should have a ups that ... | |
| Electrical Engineering | 9/23/2010 |
| Q: How to select CT ratio for motor over load protection. A: See this discussion: ... | |
| ELECTRICAL ENGINEERING | 9/23/2010 |
| Q: THE CONCEPT OF REFLECTED LOAD AND IMPEDANCE MATCHING IN TRANSFORMERS A: A perfect transformer (with no loses, no stray reactance, etc.) reflects the load on the secondary ... | |
| HELP! How to use small appliances from US in South Africa | 9/21/2010 |
| Q: ..I believe that you assisted me a few years back. My husband and I have relocated to S. Africa and ... A: Running small kitchen appliances at 50Hz should not damage them in the short term or the long term ... | |
| inductor design | 9/20/2010 |
| Q: sir, what r the factors to be taken into consideration while designing an inductor? how can we wind ... A: Things that effect the inductance and electro magnetic properties: Number of turns Diameter of coil ... | |
| Current and Voltage | 9/19/2010 |
| Q: I don't really understand the difference between a voltage source and a current source in a circuit ... A: Constant current is usually a function of the operation of the circuit. In practice for simple ... | |
| voltage spikes/outages | 9/18/2010 |
| Q: Are flat screen televisions susceptible to damage from hard shut off during power outage? Should a ... A: You can put a tv on a UPS if you want. It is more a question of where you live and what kind of ... | |
| Current and Voltage | 9/18/2010 |
| Q: I don't really understand the difference between a voltage source and a current source in a circuit ... A: A voltage source is like a battery; it has voltage or electromotive force and an very low internal ... | |
| transformer to junction box | 9/16/2010 |
| Q: The led lights i bought to go around my pond come with a 12v transformer, I somehow need to connect ... A: Do you not have a mains outlet socket on the outside of the house? If you do, merely plug the ... | |
| permanent magnet generator | 9/13/2010 |
| Q: Permanent magnet generators have specific RPM ratings and power output. My question is, why is the ... A: Torque and HP are related by rpm. Here is a little tutorial that will help you understand it ... | |
| electrical engg. | 9/10/2010 |
| Q: how does corona in transmission lines increase the capacitance of line?what all disadvantages does ... A: Corona is the discharge by ionization of the air due to the high voltage. It causes a very small ... | |
| wiring. | 9/10/2010 |
| Q: I need basic idea on wiring. what is the significance of eath wire? can't we go without earth wire? ... A: The earth wire or ground is primarily for safety reasons. It protects the user from getting ... | |
| electrical engg. | 9/8/2010 |
| Q: why is it necessary for the electromagnetic torque and direction of rotation of rotor be same for ... A: When a coil of wires is rotated or passes through a magnetic field it induces current flow through ... | |
| electrical engg. | 9/8/2010 |
| Q: why is it necessary for the electromagnetic torque and direction of rotation of rotor be same for ... A: Not sure I understand the question. But let me try an answer. ONE: Direction of rotation can be ... | |
| interferance from treadmill | 9/7/2010 |
| Q: We have Direct TV for our satellite service....and when ever we use the treadmill we loose our ... A: The 30 seconds is due to build up in memory inside the tv, so that would be normal. How far apart ... | |
| electrical engineering (Energy Management) | 9/6/2010 |
| Q: Q.1: What is major Attributes of Hydropower, explain positive and negative? Q.2: Discuss on ... A: This seems to be a class assignment or student project. We hesitate to do student assignments; but ... | |
| about DC carbon brush | 9/6/2010 |
| Q: How to make DC carbon brush.what is their raw material. ANSWER: This is a good starting point in ... A: It is contained within the wiki paper........ The exact carbon and graphite depends on your ... | |
| electrical engg. | 9/5/2010 |
| Q: why do some places have supply of 50 hz,220V and some 60 Hz,110V?? ANSWER: In the early days of ... A: Yes, you are right. But in the days when the standards were established there were many other ... | |
| electrical engg. | 9/3/2010 |
| Q: why do some places have supply of 50 hz,220V and some 60 Hz,110V?? A: In the early days of electrical distribution and design of generating machinery each country decided ... | |
| electrical engg. | 9/2/2010 |
| Q: does high load mean high current or high resistance? Does ohms law helps good to xplain this??? ... A: Switching on an additional device increases the power load by adding more impedance in parallel with ... | |
| electrical engg. | 9/2/2010 |
| Q: does high load mean high current or high resistance? Does ohms law helps good to xplain this??? A: It could be either; depends on the context of the discussion. But, in most cases, especially in ... | |
| Electrical Engineering | 9/1/2010 |
| Q: Can you Please describe me general methods for fault location and give me comment on the ... A: You must help me focus on the field of engineering you are thinking about. If you are interested in ... | |
| Home wiring. | 8/21/2010 |
| Q: What happens when I cross a power lead to neutral? A: Neutral? or Ground/earth? You could get mini explosion or breaker OUT if it is a quick breaker. At ... | |
| Extend Your PCs Battery Life With A Car Battery | 8/21/2010 |
| Q: i extend my pc ups to a 50 ah car battary ,my question can i extend my pc ups 350W ta a 200 ah ... A: If you follow the safety principles and hook up procedures in the video you should be alright. I ... | |
| power factor correction | 8/18/2010 |
| Q: can u tell me what is power factor correction? how we can define it? A: Here is a good tutorial about PF: http://en.wikipedia.org/wiki/Power_factor In simple terms, ... | |
| electrical engineering | 8/16/2010 |
| Q: I am 4th year electrical &electronics student at Arbaminch, Ethiopia university & searching for ... A: You must first think of the area of technology you are interested in and the level of interest and ... | |
| running a current through a magnet | 8/10/2010 |
| Q: I am wondering what would happen if an electrical current was run through a permanent magnet. Could ... A: Depends on the permanent magnet material you might be using; some are not very conductive. Also, ... | |
| calculating required force of solenoid actuator | 8/9/2010 |
| Q: I am trying to work out how much force I need to generate using a solenoid. In the image you can see ... A: And how rapidly it must move. Most solenoids have excessive magnetic forces in order to activate ... | |
| electrical | 8/8/2010 |
| Q: what is the use of reactive power in electricity A: Reactive power occurs when the voltage and current are out of phase with each other. It is caused by ... | |
| electrical engineering | 8/6/2010 |
| Q: A sinusoidal AC is specified by the equation, I = 205 sin(628 t) mA. Determine: a)the ... A: This looks like a homework assignment. Yes? We don't do home work for students but we can get you ... | |
| piezoelectric actuators | 8/3/2010 |
| Q: I am doing some research on piezoelectric actuators. I want to find out if a cylindrical ... A: Don't know why not. Piezoelectric effect is at the microscopic level so it should work but your ... | |
| increasing the KVA supply of the hospital | 8/3/2010 |
| Q: sir: i have a project study about a hospital where it need to synchronize the generator and increase ... A: How about "Increasing the Power Supply Output of the Generating System of the Blank Hospital"? OR: ... | |
| REGARDING POWER GENERATORS | 8/2/2010 |
| Q: I have a doubt regarding electrical generators. when a 1 mw generator(containing the coil & ... A: First, see this reply to another question some time ago: ... | |
| Using electromagnets to rotate objects | 8/2/2010 |
| Q: I have another question about using electromagnets to rotate an object. In the picture are two ... A: The red shaft must be non-magnetic. The magnetic attractions will be stronger to the closer ... | |
| Electrical Engineering | 8/1/2010 |
| Q: A complex waveform is described by the equation: v= 100sin(100πt)+50sin(200πt-π/2) ... A: I think you can do this on a handheld graphic calculator or pc using online graphic solvers. To do ... | |
| Electrical Earthing Pit Resistance | 7/31/2010 |
| Q: How far can i extend the earthing point from the Electrical earthing pit? A: I have had this question before and researched it for another person but don't remember the answer. ... | |
| Electrical Engineering | 7/27/2010 |
| Q: Can you please describe me how the control of voltage, frequency and power factor of a synchronous ... A: Your question is very broad so I am going to give you some very broad reference material to study ... | |
| Electrical Engineering | 7/27/2010 |
| Q: can you please explain me and describe how you would accurately define the surge point over a wide ... A: Is this what you are looking for? http://204.168.68.51/controls/sc0498.htm IN this site there are ... | |
| Reverse power on Generators | 7/26/2010 |
| Q: How can we test reverse power on Generators running in parallel? Appreciate your advise in this ... A: My opinion is that the generator under test would have to be disconnected from the others. However, ... | |
| Electrical Engineering | 7/24/2010 |
| Q: Can you help me with 2 questions below please A C-R circuit consists of resistor of 2 M Ω ... A: These are engineering student level problems and I am going to give you some guidance but you will ... | |
| DE Bearing Temperature | 7/21/2010 |
| Q: What is the maximum acceptable criteria of DE bearing temperature for motor run test and if the ... A: Sorry, I am not an expert in this area. There are standards for conducting such test published by ... | |
| Using an electromagnet to rotate something | 7/19/2010 |
| Q: Konichiwa Cleggsan, this is Eddie here with more questions on electromagnets ("Not this guy again!") ... A: You need to study motor theory. You can google for how motors and servos work. But, essentially, ... | |
| details abt forlulae | 7/17/2010 |
| Q: i need basic power calculation,current,load,voltage drop formulas pls provide A: You are asking for Ohm's Law? Why don't you take a look here. This will give you all you need ... | |
| more on electromagnetic workings | 7/16/2010 |
| Q: Arigato gozaimasu! Thanks Cleggsan. I tried to ask a follow up question to the last answer you gave ... A: No, resistance is an electrical term given in ohms. The resistance of the electrical circuit that ... | |
| more on electromagnetic workings | 7/16/2010 |
| Q: Arigato gozaimasu! Thanks Cleggsan. I tried to ask a follow up question to the last answer you gave ... A: Do you know about ohm's law? Very simple equation that rules the electronic universe. Voltage = ... | |
| small electromagnet dimensions | 7/15/2010 |
| Q: Konichiwa again Cleggsan, Thanks for your previous answers. I have question regarding the design in ... A: Yes, the red metal rod would make a great difference in the distribution of the magnetic field when ... | |
| Resistor in series | 7/11/2010 |
| Q: in the following design: http://www.discovercircuits.com/DJ-Circuits/batchargeind1.htm R4 is in ... A: Could be kick back on the line from the charger or something like that. Probably only the author of ... | |
| synchronizing two generators | 7/10/2010 |
| Q: i have a project study on to synchronize generators of a hospital.. the generator have 313kva, they ... A: Let me first say that I am not an expert in this area. But, I believe it is possible to synch the ... | |
| Inverter and PI conrtrol | 7/9/2010 |
| Q: To design of inverter system Can i able connect PI controller to generate PWM signal for IGBT full ... A: Yes, you can do this. I found, with a few google searches, a few papers and articles that will ... | |
| projects | 7/9/2010 |
| Q: i am student of finl year electrical engneering ,i want some project topics regarding simulation ... A: You must let your heart and passion guide you in selecting the project. Take in to consideration ... | |
| projects on electrical engineering | 7/4/2010 |
| Q: I am a final year student and need some interesting project topics. A: May I suggest you to google around for some ideas. But, you must look into your heart and find the ... | |
| charging a lithium polymer battery | 7/1/2010 |
| Q: we are on a project that uses a lithium polymer battery and is being charged continuously by a solar ... A: I think you are losing power to the IC circuit during dark period. When the light comes back on the ... | |
| Working on high tension lines | 6/27/2010 |
| Q: One more time. When a worker on high tension line has used The wand from the helicopter and is then ... A: Yes, it can be called a Farady cage. Some just call it an insulated cage and when doing high voltage ... | |
| 4 to 20mA signal and accuracy | 6/25/2010 |
| Q: I am using instruments and connect them to the PLC using the 4 to 20mA loop. Actually the details ... A: The accuracy is mostly a function of the component matching in the circuitry. A differential amp is ... | |
| 120VAC 10Amp DPDT Relay question | 6/25/2010 |
| Q: ). I would like to build my own back up power supply for my fish tank. I have some schematics of ... A: ONE: The relay you have selected is rated plenty sufficient for a 400 watt load. TWO: The 12v dc ... | |
| 4 to 20mA signal and accuracy | 6/23/2010 |
| Q: I am using instruments and connect them to the PLC using the 4 to 20mA loop. Actually the details ... A: Sorry, don't know for sure what your application is and what you are trying to achieve. Could you ... | |
| telecommunication systems | 6/17/2010 |
| Q: Does nuclear energy have any relationship with telecommunicaction systems? if yes, how can I get ... A: What is your question? Could you be more specific? For example, nuclear energy generation is very ... | |
| IEC STATUTORY IMPEDANCE VALUE | 6/10/2010 |
| Q: What's the IEC minimum and maximum statutory impedance value between two phases(i.e, R&Y or R&B or ... A: Not sure of the question. Are you referring to broadcast links or receiver circuitry????? Nominal ... | |
| Finding it difficult to decide what Master’s degree to do | 6/3/2010 |
| Q: I’m having a bit of a problem at the moment. I’m trying to choose a Masters degree but I’m finding ... A: These are the decisions of life. Trying to anticipate the future is a dangerous business; not many ... | |
| electrical power | 6/1/2010 |
| Q: what is the perfect definition of (1)active power (2)reactive ... A: You can get these definitions with a simple google search or go to such dictionaries as: ... | |
| DC starter/generator regulation | 5/30/2010 |
| Q: I have an ex military J69 jet engine which is instaled in an experimental aircraft for recreational ... A: Theoretically it doesn't matter, at least from the generator point of view. The issue is to get ... | |
| DC Power supply transformer | 5/29/2010 |
| Q: I have a Leitch system clock with an unusual power supply transformer connection. One PRIMARY leg ... A: Well, yes, the Leitch design is a form of switching power supply or SMPS (Switching Mode Power ... | |
| DC starter/generator regulation | 5/29/2010 |
| Q: I have an ex military J69 jet engine which is instaled in an experimental aircraft for recreational ... A: Don't know what you have. Most of these Lear generator sets are made by FORD Instruments and they ... | |
| DC Power supply transformer | 5/28/2010 |
| Q: I have a Leitch system clock with an unusual power supply transformer connection. One PRIMARY leg ... A: That's Leitch for you. They use some pretty far out circuitry. I once had an engineer who was ... | |
| engineering | 5/27/2010 |
| Q: what are the applications of integral calculus in engineering devices? would appreciate a link if ... A: http://www.rapidlearningcenter.com/mathematics/Preview/RL415/PT/CA2_CT01_IntroductionToCalculusII.pd ... | |
| electrical engineering main project | 5/25/2010 |
| Q: sir, i request you to kindly help us with our electrical engineering project. we would be highly ... A: Please study my other comments about EE student projects and see if that does not help. If you ... | |
| Seeking for help | 5/24/2010 |
| Q: I want to design a transformer for a UPS of 500W. Input voltage is 220v. Kindly provide me a ... A: First UPS supplies are generally rated in VA rather than watts because the power load is often not a ... | |
| converting 60 hertz to 50 hertz | 5/21/2010 |
| Q: I have a washing machine from usa and want to use in australia. I got a power convertor but washer ... A: Converting frequency is very difficult. It will cost more than the price of a new washer to do it ... | |
| electrical engineering | 5/20/2010 |
| Q: what are the risks involved in the fabrication of a guitar amplifier (a tube guitar amplifier)? Its ... A: Not sure of the question. Are you concerned about it from cost or legal or technical or safety ... | |
| valve cpt | 5/19/2010 |
| Q: the valve is hunting around the set point when you give it command to open or close to certain ... A: Check the servo motor or the servo system. Hunting is usually something that has caused the servo ... | |
| the arrangment of electromagnets and connected pieces of metal | 5/18/2010 |
| Q: Konichiwa Cleggsan! You were kind enough to help me with a few questions about the ins and outs of ... A: Omoshoroi Hard to say because you do not show any dimensions in the drawing. Keep in mind that ... | |
| lighting entry through telephone line | 5/17/2010 |
| Q: I recently had lightning strike my home for a second time in less than a year.I would like to know ... A: Electrical energy from lightning and electrical storms can enter by just about any means. It is ... | |
| scr | 5/17/2010 |
| Q: i m working in sintered products plant, we are having a furnance in which heaters are connected to ... A: Without knowing the exact model information and circuit design cannot give you specific information. ... | |
| Relay won't re-open | 5/16/2010 |
| Q: I bought a garage-door opener transmitter/receiver set to remotely operate a 12v DC relay. The ... A: I would have to see the circuit schematic in order to analyze what is going on. Unless there is a ... | |
| DC Power Supply - Wiring in Parallel | 5/15/2010 |
| Q: I have two devices that came with 12v/100mA power supplies. I have a 12v/450mA power supply I'm not ... A: Not a good idea to put power supplies in parallel (or series, for that matter) except in very ... | |
| Canon printer purchased in UK--will it be ok to use printer in US | 5/15/2010 |
| Q: I purchased a Canon printer while living in the UK. The correct power supply voltages and ... A: Yes, you can use it during in usa but it must have the correct voltage. In the USA it is always ... | |
| summing amplifier | 5/13/2010 |
| Q: hey, I'm building a circuit and i need to know what must be the values for the parts. him measuring ... A: How about this approach? http://www.play-hookey.com/analog/experiments/summing_amplifier.html And, ... | |
| DC Generators | 5/12/2010 |
| Q: A speed indicating device consists of a 2 pole permanent magnet DC generator with a 2000 ohms DC ... A: Sounds like a student problem - which we don't like giving answers. But, here is a hint on how to ... | |
| Sensing voltage from microcontroller | 5/12/2010 |
| Q: First of all, I'm very grateful to you since you have always given me a prompt and helpful answer to ... A: Sorry for the delay. This seems like a voltage detector and a differential circuit that operates a ... | |
| Electrical Engineering Math | 5/10/2010 |
| Q: I am writing a paper for pre-calc class. I have to find out what formulas or equations an ... A: All engineering programs are extremely quantitative. Math, applied math, is at the root of ... | |
| Trafo Connection | 5/8/2010 |
| Q: is there an open-star transformer connection system? If there is, what is the purpose, voltage ... A: Yes, of course. Star and Delta connections are many and the applications and mis-applications are ... | |
| blow up transformer and generator | 5/3/2010 |
| Q: I've connected a generator of 450 volt to a delta - WYE transformer ( 450 Volt / 13.8 KV ) . After ... A: Yes, switching gear could be a source. Not understanding how the switching is configured would lead ... | |
| Freezer for rv | 5/1/2010 |
| Q: I have bought a 135 lt freezer for my rv in africa. It draws 3.2 amps on 12/24 v or 0.42 amps on 220 ... A: Either way it draws about 100w to keep it going. If you connect to battery only the freezer will ... | |
| walkie talkie | 4/30/2010 |
| Q: I am into a project to construct a walkie talkie which will have a long talking range.What do i need ... A: Radio devices in the UK, like in most countries, are regulated as to rf frequency you may use and ... | |
| battery charger | 4/30/2010 |
| Q: I have 220Volts battery charger. 12 volts 60 amps. how many watts and amp the battery charger eat? A: Power equation says P = Voltage X Current. So, in your case if the battery charger is capable of ... | |
| Reactive Power | 4/29/2010 |
| Q: If I want explain the concept of reactive power to somebody, how am I supposed to it? To be honest I ... A: If you go to this web page: http://www.leonardo-energy.org/explaining-reactive-power you will find ... | |
| Charging batteries | 4/26/2010 |
| Q: What is the best way to recharge Ni/Cd rechargeable batteries ? Should they be recharged after use ... A: Ok to leave on charge for short periods of time. But, when not in use they should be left idle with ... | |
| blow up transformer and generator | 4/26/2010 |
| Q: I've connected a generator of 450 volt to a delta - WYE transformer ( 450 Volt / 13.8 KV ) . After ... A: First guess would be wrong wiring. Check it out thoroughly. Second guess would be the grounding. ... | |
| Wireless PCI Card | 4/24/2010 |
| Q: I recently bought a mini PCI card for my laptop. When I was installing it I noticed that there were ... A: It is called "diversity" reception and utilizes the best signal from either antenna or both of them ... | |
| earth cable mixed up | 4/22/2010 |
| Q: .. I have simple electrical questions that I am having a lot trouble with. Control cable and earth ... A: Well, this is an engineering question of great import. The answer lies in knowing the details of ... | |
| Batteries | 4/19/2010 |
| Q: I'm not sure this is a proper question to be asking you but I would appreciate it if you could you ... A: Well, there may not be a "B" size anymore, but there are many others. Over the years some have gone ... | |
| negative polarity | 4/15/2010 |
| Q: I have a boat and changed all the gauges on the dash--I measured the voltage on the volt gauge and ... A: Check your battery connection. Some systems have the (+) going to ground and the (-) is hot. Thus ... | |
| final year project | 4/11/2010 |
| Q: give me some topics and it's detail A: General discussion about projects: http://www.physicsforums.com/showthread.php?t=255986 ... | |
| improving TS skills | 4/9/2010 |
| Q: I have an AAS in electronics and have been working in aerospace for the past 4 years as a Tech. I ... A: Not knowing your understanding of theory let me say that board level troubleshooting, testing, ... | |
| Initial 12v DC AMP draw | 4/9/2010 |
| Q: Is there something I can put between the 12 V Battery and a devise like a fan motor that will stop ... A: Got that. Thanks. Now I know what you are talking about! My answer remains the same. A bigger ... | |
| Initial 12v DC AMP draw | 4/8/2010 |
| Q: Is there something I can put between the 12 V Battery and a devise like a fan motor that will stop ... A: I am guessing you are talking about electric cars running on game tracks? Not street cars with ... | |
| 400Hz generator | 4/7/2010 |
| Q: How does a generator work on 400Hz? A: Well, basic generator design for alternating current generation is the same for any frequency. The ... | |
| regarding reactive power and voltage relation | 4/6/2010 |
| Q: what is the main concern with reactive power and system voltage in power system?and also what causes ... A: Good Questions. ONE: Reactive power increases current flow, even though it is not "power ... | |
| Electromagnetic boosting | 4/6/2010 |
| Q: Konichiwa again Cleggsan! Thanks for all your help you have given me recently! I have a need to ... A: Since there are no dimensions shown I assume it is only schematically correct. In figure 1, for ... | |
| LNB power supply | 4/5/2010 |
| Q: For a typical satellite TV system, how is the power derived for the LNB? Is there a DC supply ... A: Power comes up from the in-house receiver on the coax line. It is dc coupled to the amplifier in ... | |
| operational amplifier | 4/2/2010 |
| Q: what is the evolution of operational amplifier A: Please google for this; there are many historical and technical sites that can be found for your ... | |
| operational amplifier | 4/2/2010 |
| Q: 1-question-in the preparation of operational amplifier why the first stage is having a double output ... A: Differential amplifiers are common in op-amp designs. It depends on their usage, but so many are ... | |
| How far does electromagnetic attraction exted? | 4/1/2010 |
| Q: You were kind enough to answer a question of mine about six months ago - thanks for that! Today I ... A: MEM (Microelectromechanical systems) is a field that provides for very small such systems. Cost is ... | |
| Monopole Impeance Matching | 3/31/2010 |
| Q: I read your previous answer on Impedance matching. I would like to ask a follow upThe following are ... A: Sorry, image did not make it through. With an impedance of +20j it means it is reactively ... | |
| How far does electromagnetic attraction exted? | 3/31/2010 |
| Q: You were kind enough to answer a question of mine about six months ago - thanks for that! Today I ... A: You are pushing it now. You cannot selectively switch the fields unless each node has its own ... | |
| How far does electromagnetic attraction exted? | 3/30/2010 |
| Q: You were kind enough to answer a question of mine about six months ago - thanks for that! Today I ... A: You would be much better off putting the electromagnetic coils close up on the end of the metal rod ... | |
| Monopole Impeance Matching | 3/30/2010 |
| Q: I read your previous answer on Impedance matching. I would like to ask a follow upThe following are ... A: Try this chapter and see if it doesn't work for finding a solution: ... | |
| Zero Sequence Reactance | 3/29/2010 |
| Q: Why Zero sequence reactance of an Alternator is low? A: I have no idea what the question is. Can you be more specific? Does this answer help? ... | |
| RTD Temperature High at Starting of Motor | 3/27/2010 |
| Q: I have a problem related to RTD. Motor winding Temperature goes suddenly High at Starting of Motor ... A: Here is a rather long discussion about RTD temperature rise conditions that may or may not relate to ... | |
| Step Down DC Circuit Design | 3/27/2010 |
| Q: Greetings, I hope this question falls within your area of expertise. If not, I am sincerely very ... A: There are many simple and all the way to elegant ways to convert 12v down to 1.5v. For example, ... | |
| reducing ripple voltage | 3/26/2010 |
| Q: I am building an DC DC boost converter and i need to use PI control to generate PWM. I have created ... A: Well, 660 uF would be plenty at the CD sampling frequency. And, are you sure it is hum/ripple? It ... | |
| decibels | 3/26/2010 |
| Q: So from the formula dB = 10log(P1/P2) If we substitute P = V^2/R We get dB = 20log(V1/V2) My ... A: The voltage formula is just for showing the same db range when looking at the line with a voltage ... | |
| reducing ripple voltage | 3/25/2010 |
| Q: I am building an DC DC boost converter and i need to use PI control to generate PWM. I have created ... A: The fact that ripple was reduced by adding a capacitor is a good sign. But, you didn't mention the ... | |
| Safety of elecrical step-down converters | 3/25/2010 |
| Q: We have a number of children's toys which are powered by batteries. This works out pretty expensive. ... A: Yes, if you are talking about the little power paks that plug into the wall outlet and have a cable ... | |
| electrical | 3/24/2010 |
| Q: what is the use and difference between circuit braker and relay? A: Relay: http://www.howstuffworks.com/relay.htm http://en.wikipedia.org/wiki/Relay Circuit Breaker: ... | |
| Steganography | 3/23/2010 |
| Q: ..i need a final year project topic centered around the use of steganography in medicine or rather ... A: Don't know how advanced you are but here are some embedded ideas: ... | |
| h bridge | 3/18/2010 |
| Q: I am working with h bridge inverter .For this i have choosen IRF840.Inorder to drive gate SL100 is ... A: Characteristics of the IRF840 are: VDS, DRAIN TO SOURCE VOLTAGE (V) 0 3 6 9 12 15 15 12 9 0 6 ID, ... | |
| Blinking light | 3/16/2010 |
| Q: Our outside driveway light stopped working. It had been on a dimmer switch and had a light sensor on ... A: The blinking is caused (in the cases I know of) by the light which turns on and tells the sensor it ... | |
| PWM using PI control | 3/16/2010 |
| Q: I am building an DC DC boost converter and i need to use PI control to generate PWM. I have created ... A: That is usually due to improper loading on output. If the loading is too heavy or too reactive it ... | |
| grounded delta system | 3/5/2010 |
| Q: I belive one of my legs of my 3 phase ungrounded delta system went to ground.480v phase to phase, L1 ... A: I am trying to guess your application or circuit/system. It depends on the loading you have ... | |
| DC voltage measurment | 3/5/2010 |
| Q: Which factors affecting the value of the DC voltage when measuring with respect to ground in HV ... A: Not sure what you are asking. If you are using an oscilloscope to look at the dc voltage riding on ... | |
| electronics | 3/4/2010 |
| Q: please tell me is there any difference between build in potential and barrier potential?if yes,what ... A: If you are talking about a P-N junction then the answer lies in this wiki page: ... | |
| ram memory batteries | 3/3/2010 |
| Q: I am looking for replacement batteries that were mounted on a board inside a computer controller. ... A: Got it. SAFT batteries are high quality, long lasting design for use in back up systems, ... | |
| d.c. generator | 3/3/2010 |
| Q: I am performibng preventative maintenance on a large d.c. generator. I have megged both series and ... A: They sound reasonable to me (absent knowing anything about the generator such as its power rating ... | |
| not to touch current pole in cold seasons | 2/23/2010 |
| Q: may i know why people say not to touch the current pole when the climate is very cold as if about to ... A: So sorry but I don't understand what you mean by "current pole". Are you speaking of a pole that is ... | |
| Tank circuit | 2/22/2010 |
| Q: If a charged capacitor is connected across an inductor then it discharges through the inductor and ... A: Because the currents are not equal. And, further, the voltages are probably not equal either ... | |
| How to represent back emf in an inductor. | 2/21/2010 |
| Q: Cosider the diagram I have uploaded.It shows a diode which is used to byepass the high current which ... A: Not sure I know what you mean. But let me explain further. The back emf when relay current is ... | |
| How to represent back emf in an inductor. | 2/21/2010 |
| Q: Cosider the diagram I have uploaded.It shows a diode which is used to byepass the high current which ... A: http://www.jaycar.com.au/images_uploaded/relaydrv.pdf The above circuit is nearly identical to ... | |
| Sony TV Question Previously Asked | 2/19/2010 |
| Q: I have a Sony Trinitron KV-32FS100 (not sure probably 2005 year model)and it has worked great for ... A: Your model is an LCD type television receiver. Continuous blinking is an indication of protection ... | |
| led | 2/17/2010 |
| Q: I am produce manager of Iranian company (Tlaiye) and we produce LED Advertisement and Destination ... A: Not sure exactly how you are mounting them, how many, density, heat, outdoor environment, etc. But, ... | |
| doubt in phasor diagams of transformers | 2/16/2010 |
| Q: I would like to know why does the phase angle exists between V1 and -E1 in all cases like inductive ... A: Please refer to this page: ... | |
| 50hz home theater on a 60hz supply | 2/9/2010 |
| Q: I bought this home theater (Onkyo TH-S9100THX) from Europe and found that the power rating for the ... A: Well, there could be a difference if the manufacturer did not make universal transformers - which ... | |
| converting 50hz to 60hz | 2/7/2010 |
| Q: I have recently obtained a drawer dishwasher that was mfg in Sweden and want to use it in the US. It ... A: Since it does not run continuously it is common to use European products in the USA by just adding a ... | |
| microprocessor | 2/7/2010 |
| Q: sir why we name the 8008,8016,4004 microprocessor?what is the logic behind it? A: It must be named something! From this wikipedia page http://en.wikipedia.org/wiki/Intel_8008 you ... | |
| 3 phase supply system-delta connection | 2/3/2010 |
| Q: what are the disadvantages of the on-load system like motor when it is connected in Delta Connection ... A: I am not sure I understand the question well. Let me offer this site for your review which may ... | |
| Help Me | 2/3/2010 |
| Q: I am electrical engineering student at one of Polytechnic in Malaysia.I have a problem on how to ... A: If you go back through my many comments to others who are searching for projects you will note that ... | |
| 3 phase generator | 2/2/2010 |
| Q: I have a 3phase generator that was a stand by unit designed to run full speed upon start up. I added ... A: I would not think the idle voltage would be any problem - just my opinion. However, I am not expert ... | |
| Help me!!! | 1/31/2010 |
| Q: I am electrical/electronics engineering student at Olabisi Onabanjo University Nigeria.I have a ... A: Here are two suggestions for you: ONE: The Smith Chart. Using the Smith Chart Method, compare ... | |
| Difference between Current Transformer and regular transformer | 1/27/2010 |
| Q: A current transformer must be run with a low resistance connected to the secondary because with no ... A: Yes, you are right; a transformer is a transformer. The CT is actually more of an application ... | |
| wind turbine | 1/26/2010 |
| Q: I have a 10 kw wind turbine that is grid tied using 2-6000 watt inverters. On rare occasions it gets ... A: Yes, I got it. As you have certainly learned from the manual the inverter should never have a dc ... | |
| wind turbine | 1/26/2010 |
| Q: I have a 10 kw wind turbine that is grid tied using 2-6000 watt inverters. On rare occasions it gets ... A: I would have to know more about the inverters to give an intelligent response. Can you give me ... | |
| Power transistor useage | 1/25/2010 |
| Q: I'm an experienced motor vehicle technician just starting on my own business of repairing vehicle ... A: Sounds like a viable solution. There are many, many switching transistors to choose from; the one ... | |
| Power transistor useage | 1/25/2010 |
| Q: I'm an experienced motor vehicle technician just starting on my own business of repairing vehicle ... A: Yes. There are plenty of semiconductor devices that will handle this kind of power. The problem, ... | |
| generators | 1/24/2010 |
| Q: A brushless 75 kw generator set has been used 9000 hours, How much more life does it have to be ... A: I cannot tell you. It depends so very much on the manufacturers design, materials used, the loading ... | |
| EE senior design project - audio engineering | 1/21/2010 |
| Q: I am looking for a topic for my senior design project in the field of audio engineering. Could you ... A: Not sure about the "kit" as I just don't remember and I could not locate the answer given related to ... | |
| dcdc converter with PWM and PI controller | 1/20/2010 |
| Q: I am very new to dc dc converter. In some dc-dc converter why we need to add PWM, PI controller and ... A: Dc cannot be sent through transformer like AC. So, the idea of a dc to dc converter is to convert ... | |
| CT METERING | 1/19/2010 |
| Q: CAN CURRENT CARRYING CONDUCTORS PLACED NEAR TO CTs OR TOUCHING THE CTs AFFECTS THE OPERATION OF THE ... A: Yes. If the current is large enough to produce a significant field and if the conductor is near ... | |
| cable with less voltage drop | 1/19/2010 |
| Q: I have a generator which is to deliver 1,352 Ampere over a distance of 900 meters. As per the design ... A: A transformer is a good solution because it would allow the transmission voltage to go way up and ... | |
| Power | 1/18/2010 |
| Q: i did a practical assignment in college and did predicted power, current and voltage reading using ... A: Well, wire filament lamps are a non-linear resistance. They will change dramatically with ... | |
| can you answer my question | 1/17/2010 |
| Q: can you please answer the question listed below. "Write a sequence of instructions to exchange two ... A: No, we don't do homework type questions, sorry. But you can google and find many ideas for your ... | |
| LED stays on after being turned off? | 1/14/2010 |
| Q: I have attached the positive side of a 3 volt led light to a toggle switch and then to a 3 volt ... A: Do you have an ammeter or vom with amp reading capability? If so you can measure the current when ... | |
| power supply | 1/13/2010 |
| Q: i we give input (220v,5A) to a load and when we measure output from the load we get again the same ... A: As a policy we don't do homework for student assignments but will offer suggestions on how you can ... | |
| vintage resistors wire wound hollow tube | 1/3/2010 |
| Q: I cannot find 100 ohm of similar 3 cm by 1 cm length by diameter to replace. Problem is that there ... A: No, you cannot guess the resistance value. It must be set by measuring the output current in the ... | |
| vintage resistors wire wound hollow tube | 1/2/2010 |
| Q: I cannot find 100 ohm of similar 3 cm by 1 cm length by diameter to replace. Problem is that there ... A: Are you sure the original wire wound has exposed wires that are making contact with the circuit OR ... | |
| about all experiment in electrical engineering | 12/29/2009 |
| Q: in bhopal there is no facilities for lab practicals in engineering colleges ,is any way to perform ... A: Well, there are many solutions for you. - Dry lab. That is, study and participate in the virtual ... | |
| telivision Power Supply | 12/29/2009 |
| Q: There is no input power to my Telivision when the push button switch is being activated. I would ... A: Since this question came in on my Electrical Engineering question blog I am assuming you need a ... | |
| NPN transistors | 12/27/2009 |
| Q: how are npn transistors fabricated? A: Depends; discreet transistors are fabricated differently from those on IC chips. But the basic ... | |
| Fuse wire | 12/26/2009 |
| Q: I am an undergraduate student doing my electronics and communication engineering. I have a small ... A: Fuse is for protection. If the conducting wire from source to the load is not under any danger the ... | |
| electricals projects | 12/17/2009 |
| Q: can you give me list of latest project topics on electricals and power electronics A: I just replied to another student who has interest in "communications" but the same idea applies ... | |
| Help me!!! | 12/17/2009 |
| Q: I am electrical/electronics engineering student at Olabisi Onabanjo University Nigeria.I have a ... A: Please refer to my many replies to others with the same question. You can find my archive of ... | |
| Kinetic Sculpture Mechanism | 12/15/2009 |
| Q: Cleggsan, I do not know if the title explains what I need but it was the only name I came up with. ... A: Here are some ideas: http://www.heliotrack.com/Products.html http://www.rjpond.co.uk/reflector.htm ... | |
| instruementation | 12/14/2009 |
| Q: sir please explain me the logic and how a level sensor and level transmitter works in a water ... A: There are a few methods for such a system; from simple to complex. Look through this discussion ... | |
| make christmas tree lights blink slowly | 12/14/2009 |
| Q: I really like the traditional Christmas tree lights of my childhood and finally found strands of ... A: How about this one? http://www.bowdenshobbycircuits.info/page7.htm#aclamps.gif Something a little ... | |
| Electrical Engineering- Ground Test | 12/13/2009 |
| Q: I want to test the grounding of the machine. Whether the machineries (3 phase, 400V AC, 10 KW) are ... A: There are many methods and procedures and it greatly depends on the installation, environment and ... | |
| LED Brightening Circuit | 12/12/2009 |
| Q: I am trying to find a circuit that when voltage is applied, it will gradually brighten a string of ... A: Don't know how sophisticated you want to go but the digital electronics solution is probably the ... | |
| Induction Motors | 12/9/2009 |
| Q: We recently experienced a 250hp/4160VAC motor failure. The motor drives a multistage boiler water ... A: See this page; go down about half way and read the section Universal motors and series wound DC ... | |
| Capacitor selection | 12/7/2009 |
| Q: Which value of R & C you will select for 1 mS time constant? (i.e. what are the major parameters of ... A: Resistors come in standard values of 1, 2.2, 3.3, 4.7 and 9.1 usually. Capacitors come in many ... | |
| stability of control system | 12/6/2009 |
| Q: I reffered many text books for the definition of STABILITY OF A CONTROL SYSTEM,what i found is "sys ... A: let us consider real time example of "desired speed of a car",if the car is not running with desired ... | |
| CAPACITORS | 12/2/2009 |
| Q: Can a Capacitor be made to expel it's charge over a long period of time like a battery ? A: Yes. The amount of charge and therefore the time it will take to discharge it is a function of the ... | |
| power systems | 12/1/2009 |
| Q: why a battery gets discharged when it is kept under high voltage line? ANSWER: Could you clarify ... A: I have never heard of such a thing. The only way a battery can be discharged is with some ... | |
| Reducing 40amps to milliamps | 12/1/2009 |
| Q: How to reduce a 40amps from a car battery to milliamps for some simple circuits? I'm using the ... A: Of course. It is simple Ohms Law and Kirchoffs Law of current and branch networks. Current is ... | |
| Electrical load | 11/25/2009 |
| Q: I would like to know the mechanisms about how the insulator for cables at high voltages broke down ... A: Sorry, I am not an expert on autocad. But I found many discussion forums and groups that discuss ... | |
| Electricity generation theory | 11/23/2009 |
| Q: In the electro-magnetic generation, we have read the votage generation, V= Vm x Sin (theta). I am ... A: You were very clear and the answer remains the same. If the conductor loop (coil) is rotating such ... | |
| DC motor brush replacement | 11/22/2009 |
| Q: should I replace carbon brushed of DC motor as a complete set? or can i replace only worn ones? A: Best to replace them both at the same time. For practical reason as well as to keep all currents ... | |
| Electricity generation theory | 11/22/2009 |
| Q: In the electro-magnetic generation, we have read the votage generation, V= Vm x Sin (theta). I am ... A: Theta is angle. If angle is perpendicular then sin theta is 1. If angle, then induced voltage is ... | |
| VA rating equipments | 11/19/2009 |
| Q: I would like to know the mechanisms about how the insulator for cables at high voltages broke down ... A: Well, when the load is purely resistive the voltage times the current in amperes gives true wattage ... | |
| power converters | 11/18/2009 |
| Q: i need power electronics projects for M.E(power electronics). power electronics used in biological ... A: It is a broad field. Please narrow it down. But, you can do this. Think of an area of the ... | |
| initial conditions | 11/17/2009 |
| Q: what is the effect on RC circuit network if initial conditions are not zero? A: Are you thinking with an AC signal source or DC? In the case of DC battery driving the circuit and ... | |
| solar wind turbine | 11/16/2009 |
| Q: im currently doin a hybrid solar wind project. I need help in making mini solar panels,and ... A: Have you googled/binged for your system design? There are many online system information pages to ... | |
| sewing m/c | 11/14/2009 |
| Q: to buy a sewing m/c has a a/c d/c adoptor 12V 1500ma is a strong drive. what RPM A: You must check the sewing machine specifications. The manufacturer can tell you what speed motor. ... | |
| Total wattage | 11/13/2009 |
| Q: If I have an AC source which has three 220VAC lamps connected to it and a power supply (220VAC ... A: Wattage is calculated by: 1. P (watts) = Voltage X Current 2. P = Voltage Squared/Resistance ... | |
| Lighting | 11/9/2009 |
| Q: What percentage power is absorbed by a standard ballast and what percentage is absorbed by an ... A: I don't know the exact answer to your question, but here is a very instructive site with a ... | |
| three phase convertion | 11/9/2009 |
| Q: I have printing machine which required three power supply 5 HP, I have learned that i can made a ... A: From everything I have learned it is a better solution to just replace the motor with a new single ... | |
| conventional current flow | 11/8/2009 |
| Q: What is the direction of the conventioanl current flow inside a battery?? A: Who knows? There are so many theories and conventions for circuit analysis that it is hard to say. ... | |
| Power Factor | 11/7/2009 |
| Q: I am conducting an experiment in which I have an auto transformer connected to a 35 ohm load. I have ... A: Yes, you are doing something wrong. It is very difficult for it to be greater than one unless you ... | |
| Power Distrubution Frequency | 11/5/2009 |
| Q: Is there any reason why the US power grid runs on 60hz, and why is it so important to maintain this ... A: Yes, of course. The history is well known as to why 60 Hz was chosen. In the very early days there ... | |
| voltameter | 11/3/2009 |
| Q: what is the history of voltage devices A: Your question is very broad. What do you mean when you say voltage "devices"? There are many. Are ... | |
| communications project | 10/31/2009 |
| Q: I am a 4th year student doing a project in encoding and encryption. The project involves the ... A: I found some discussion about that in this paper: ... | |
| solar energy | 10/30/2009 |
| Q: Sir, Is it possible to use solar energy for my home use? if yes then how and which device should ... A: Oh, what a question. It is asked every day by someone. But, from a scientific point of view it is ... | |
| measuring of current | 10/30/2009 |
| Q: Please tell how can DC current from DC source be measured with the help of ammeter? I think if ... A: To measure current with an ammeter the current must pass through the meter. So, the circuit must be ... | |
| Final Year Project | 10/29/2009 |
| Q: I am in my final year of Graduation . I want list of Projects from your side which can help me out ... A: I suggest you choose one that a) fits the course requirements and b) is of great personal interest ... | |
| The voltage across the emitter resistor in a Voltage divider Common Emitter Transistor | 10/29/2009 |
| Q: How do we go about calculating the voltage across the emitter resistor? I have seen that it should ... A: Can I assume you are talking about a Class A biased linear amplifier? If so, the correct biasing it ... | |
| Network jammer | 10/28/2009 |
| Q: I want 2 design an electronic circuit capable of blocking mobile signals within a given region. This ... A: Please read through these web sites and be clear about the legality of owning and operating such a ... | |
| electrical | 10/13/2009 |
| Q: I'm trying to see how many watts my computer takes and I need help. My computer is a desktop ... A: If it is a desktop PC I assume you are running it off the 120v ac line. Correct? Power = Voltage ... | |
| project ideas | 10/7/2009 |
| Q: i m an electrical engineering student searchin for some good topics for my project. plz suggest me ... A: May I refer you to my replies to the other students with the same question? You can find them in ... | |
| Building a very small electric keyboard | 10/6/2009 |
| Q: I'm looking to invenst with an electrical engineer in designing a keyboard synth about 7 inches in ... A: Design and development of keys with tactile touch is no small task. Yamaha and Casio are leaders in ... | |
| 12 vt. DC wiper motor from 110 vt. AC | 10/4/2009 |
| Q: The motor speed needs to be variable. A schematic would be much appreciated. ... A: You did not say how many "quantity" you are thinking, but for a few hundred to a few thousand you ... | |
| 12 vt. DC wiper motor from 110 vt. AC | 10/4/2009 |
| Q: The motor speed needs to be variable. A schematic would be much appreciated. A: ONE: From the looks of the transformer in your image it may not be sufficient (power) to drive the ... | |
| Possible Electromagnet operation? | 9/27/2009 |
| Q: It may seem a little strange. I have a hypothetical situation I would like to get some advice/info ... A: Let me go back to the beginning again. Wires do not become magnetized (since they are usually a ... | |
| Possible Electromagnet operation? | 9/26/2009 |
| Q: It may seem a little strange. I have a hypothetical situation I would like to get some advice/info ... A: Let's go back to the beginning about electromagnets. The magnetic field is created when current ... | |
| Making a lightbulb blink with two batteries, two wires | 9/23/2009 |
| Q: My daughter and I worked on a science project from school where one connected batteries via wires to ... A: It can be done easily if you are allowed to use a christmas tree blinking bulb or something like ... | |
| interview | 9/15/2009 |
| Q: im in an egineering class in high school and we were assigned to do an interview with a professional ... A: Please see my web page at cleggsan.com I am now a semi-retired consultant so I will answer you ... | |
| Parallel Generators | 9/15/2009 |
| Q: I have two of the Honda generators EU200i with manufacturers recommended parallel kit reliance HP ... A: The combining kit has a synchronizing link between the two generators. These Honda units are ... | |
| 120 AC electricity into 18 volt DC electric | 9/14/2009 |
| Q: how can you built an electric converter ac to dc. 120 AC electricity into 18 volt DC. for a dewalt ... A: See previous answer. Hope you get it going. I would not use the 25v ct transformer as it will not ... | |
| 120 AC electricity into 18 volt DC electric | 9/14/2009 |
| Q: how can you built an electric converter ac to dc. 120 AC electricity into 18 volt DC. for a dewalt ... A: The reason power tools use battery power is due to the current surge required for loaded motor ... | |
| circuits | 9/13/2009 |
| Q: What size wire would you use to wire a motor that draws 16A from a cicuit? A: Well, 16 amps from 120 single phase line will most often be too much and will blow the circuit ... | |
| 120 AC electricity into 18 volt DC electric | 9/12/2009 |
| Q: how can you built an electric converter ac to dc. 120 AC electricity into 18 volt DC. for a dewalt ... A: Is this what you are looking for? ... | |
| electrical installation | 9/12/2009 |
| Q: what is electrical earth leg? what is electrical earth electrode? what is electrical earth rod? A: Earth leg: The ground line or leg of the system that is going to earth. Earth electrode: The rod ... | |
| thermocouple | 9/9/2009 |
| Q: How to identify J K type thermocouple? are there any testing methods? A: J Type J (iron–constantan) is less popular than type K due to its limited range (−40 to +750 ... | |
| design of electromagnet | 9/8/2009 |
| Q: how to design a electromagnet to produce magnetic field of .5 tesla and diameter of copper wire is ... A: http://www.geocities.com/CapeCanaveral/2404/design2.html Above is one approach. However, without ... | |
| sony projection tv | 9/7/2009 |
| Q: First of all THANKS for helping me get my projection tv convergence problem resolved. I bought the ... A: How about the vcr? Do you have one that has rf output that you can connect to channel 3? Or, if ... | |
| to have a suggestion about project topics related to electrical engineering | 9/7/2009 |
| Q: please suggest me some topics for project related to non conventional energy resources. A: It depends so much on your interest and competency level and what resources you have. But may I ... | |
| two circuit boards connected,high current loss | 9/3/2009 |
| Q: good day! we have been designing a solar powered charger. the board is composed of three modules. ... A: Got the schematic images this time. Thanks. Look, this whole thing is a matter of ohm's law. ... | |
| two circuit boards connected,high current loss | 9/2/2009 |
| Q: good day! we have been designing a solar powered charger. the board is composed of three modules. ... A: Sorry, you did not send the images. Based on what you have told me the power supply (solar panel or ... | |
| two circuit boards connected,high current loss | 9/2/2009 |
| Q: good day! we have been designing a solar powered charger. the board is composed of three modules. ... A: Sorry, you did not send the images. Based on what you have told me the power supply (solar panel or ... | |
| electric generator | 8/30/2009 |
| Q: Is it possible to have a weight driven electric generator to power and average home? I'm long on ... A: If your house during the peak of usage which is normally in the early evening with some lights on ... | |
| question on electrical engnring | 8/29/2009 |
| Q: what is exactly active and reactive power? in what context are they referred to in transmission ... A: Reactive power is current through times voltage across reactive elements in the circuit; these are ... | |
| Equivalent voltage | 8/29/2009 |
| Q: a resistance (70v) , an inductance (70v) & acapacitance (100v) are connected in series. What will be ... A: 100 is the qualitative answer for beginner student. 76 is actual voltage in complex domain because ... | |
| Equivalent voltage | 8/28/2009 |
| Q: a resistance (70v) , an inductance (70v) & acapacitance (100v) are connected in series. What will be ... A: voltage total = vr + jvxl - jvxc = 70 + j70 -j100 = 70 - j30 = 76.16v at angle of -23.2 degrees. ... | |
| 380-400V 3phase 50hz to US power 60hz? | 8/26/2009 |
| Q: Can one rewind a motor from 380/400V 50hz so it will run with 480V 60hz? Or do I have to replace all ... A: Well, it depends on what the motor is going to be used for. If it is a light weight motor and you ... | |
| lightning and batteries | 8/25/2009 |
| Q: Can a lightning strike on or near an automobile cause the battery to discharge? After a recent ... A: I wish you would have given me the make and model and year of the car. There are some cars that ... | |
| Temp Sensor Predictive Failure | 8/22/2009 |
| Q: I have 4-20mA temp sensor with temp range -50 - +150 C, is there any methode to measure when this ... A: There are many different kinds. I am assuming you are talking about a basic type which uses a ... | |
| Voltage regulator | 8/22/2009 |
| Q: I'd like to make an extrernal battery pack for my digital camera. Something I can take in the field ... A: I don't understand why you would need a voltage regulator. Batteries are already voltage ... | |
| electrical engineering | 8/21/2009 |
| Q: ............ Why the term 'cosine of phase angle' is termed as 'power factor'?Is there any physical ... A: Of course! It is the angle between voltage and current. If you put them on the scope and lock the ... | |
| projects about transformer | 8/21/2009 |
| Q: can you suggest the best project about transformer A: A really good project is to measure and report on the efficiency of different transformers. The ... | |
| short circuits in power systems | 8/20/2009 |
| Q: I would like to know the mechanisms about how the insulator for cables at high voltages broke down ... A: http://en.wikipedia.org/wiki/Electrical_breakdown Try studying the above. Does that answer your ... | |
| a/c efficiency | 8/16/2009 |
| Q: If I have an air conditioner that is rated at 115 volts 620 watts and 5.6 amps, what is the effect ... A: The greatest effect would be to overheat the compressor motor. If it is rated for 115v then you ran ... | |
| 3 Phase Power Measurement | 8/15/2009 |
| Q: Sir, We are doing the Project Real time power monitoring connected with Load. Measuring Parameters ... A: I am not clear on exactly what you want to learn but the following suggestions talk about the ... | |
| Generator | 8/14/2009 |
| Q: How much to purchase a 250 kW wind turbine generator? A: Did you do a google shopping search? There are many commercially available wind generators but it ... | |
| projects | 8/13/2009 |
| Q: i am a final year student in e&e,so can you suggest some good topics on energy system based ... A: I am getting many of these requests lately. Getting close to end of school year I suppose. ... | |
| Squelch Circuit | 8/12/2009 |
| Q: Cleggsan, I need a squelch circuit to filter low volume levels (and some noise) out of a headset ... A: An audio squelch circuit is not rocket science and it would not be difficult to construct one. ... | |
| Make a electric supercharger for my car | 8/11/2009 |
| Q: Dave thank you for answering my question. Here is a link for a picture of the wire diagram so you ... A: Well, the eram pulls a lot of current/wattage and spins up to a very high speed. The power to ... | |
| Design of electromagnet | 8/11/2009 |
| Q: I want to design a electromagnet which can produce a magnetic field of 1T,is rectangular in ... A: Sorry, but I don't understand the purpose and the application for your magnetic system. One Tesla ... | |
| Design of electromagnet | 8/9/2009 |
| Q: I want to design a electromagnet which can produce a magnetic field of 1T,is rectangular in ... A: http://www.coolmagnetman.com/magelect.htm http://www.ehow.com/how_5024621_design-electromagnet.html ... | |
| harmonic passive filters | 8/5/2009 |
| Q: My supervisor has ordered me to shift my focus to passive filters. Because since im dealing with ... A: Self resonance is when the internal capacitances of the coil itself and leads or any other nearby ... | |
| Electrical problems | 8/4/2009 |
| Q: We are running a 22 kw motor with an Inverter. In normal running, the motor is running good. But the ... A: That may be normal. Some motors use more current when speed goes down because the lower speed drops ... | |
| Reactive power and Voltage | 8/3/2009 |
| Q: What is the relation between Reactive power and voltage, in a system? Why the system voltage suffers ... A: Reactive load is when the impedance angle is other than zero (zero is for a purely resistive load). ... | |
| need suggestion | 7/30/2009 |
| Q: sir myself manish ,i am from India . i am doing power engg ,i am in second year i want to make my ... A: I suggest you think about energy requirements for generator and what the factors are for greatest ... | |
| harmonic passive filters | 7/30/2009 |
| Q: My supervisor has ordered me to shift my focus to passive filters. Because since im dealing with ... A: http://focus.ti.com/lit/an/sloa093/sloa093.pdf ... | |
| need suggestion | 7/29/2009 |
| Q: sir myself manish ,i am from India . i am doing power engg ,i am in second year i want to make my ... A: Congratulations on starting your career by getting a good education. The best strategy for power ... | |
| harmonic passive filters | 7/29/2009 |
| Q: My supervisor has ordered me to shift my focus to passive filters. Because since im dealing with ... A: I don't remember your purpose for the filters. Could you repeat for me the purpose of the filters ... | |
| harmonics filter low voltage | 7/28/2009 |
| Q: I'm doing a final year project on harmonics control in low voltage applications such as analyzing ... A: First, check the voltages and make sure all the dc levels look good. Next put the scope on the IC ... | |
| 4th year project | 7/27/2009 |
| Q: I am about to go into my 4th year of an electronics engineering course and was interested in doing ... A: Yes, it is a very interesting area and challenging to understand it because of the complexity of how ... | |
| slow cooker 50 hz vs. 60 hz. | 7/26/2009 |
| Q: Can I operate a slow cooker made for 60 Hz on a 50 Hz line? I have read the answer that 60 Hz small ... A: Yes. it will work on 50Hz frequency. If your cooker has no electric motor in it (most of them do ... | |
| power transformers | 7/23/2009 |
| Q: I am trying to get a solid grasp on how to accurately determine the maximum current draw I can get ... A: That makes all the difference in the world. This is a typical vacuum tube amplifier. The power ... | |
| power transformers | 7/22/2009 |
| Q: I am trying to get a solid grasp on how to accurately determine the maximum current draw I can get ... A: Without knowing the circuit (schematic diagram) I cannot give you a very specific answer, but let me ... | |
| power factor control-regarding | 7/22/2009 |
| Q: Is it possible to employ a smoothly variable capacitor bank in an induction motor in order to ... A: Here is a primer on the causes and cures of power factor. You may skip this if you already know ... | |
| Final year project | 7/21/2009 |
| Q: This is Artemis. I'm a final year student of electrical and electronics engineering. i would like ... A: Shame on you. Here you are a senior EE and you have not found your interest area? And you have not ... | |
| two circuit boards connected,high current loss | 7/21/2009 |
| Q: good day! we have been designing a solar powered charger. the board is composed of three modules. ... A: I would need much more information about the circuitry and interface you are using between the ... | |
| inductor | 7/20/2009 |
| Q: im chronically puzzled by the polarity of induced EMF when the power supply to an inductor is ... A: When current passing through an inductor is abruptly disconnected the current flow then stops. As ... | |
| low rpm generator | 7/16/2009 |
| Q: Some off the shelf generator requires high rmp (like 3600 rmp) and high torque to produce higher ... A: Power is power; energy is energy. Generators work on the basic principles of lenz law and ... | |
| Schematic | 7/14/2009 |
| Q: Please tell me where to find a schematic drawing for a small EDM (Electric Discharge Machining) ... A: There are many types of EDMs. What is your application? Here is an example of one - with dubious ... | |
| Electric power | 7/12/2009 |
| Q: Sir, I have learnt that when a coil of wire rotates in a magnetic field a voltage is produced at ... A: Electric energy and power is equivalent to mechanical power such as horsepower. In fact, there are ... | |
| electrical engineering | 7/11/2009 |
| Q: i have 24vdc motor with 2kw capacity,then how many voltamps transformer i need to buy? A: Transformer (step down type I assume you are talking about) should be the same rating as the motor ... | |
| related to studies | 7/8/2009 |
| Q: I wrote eamcet exam and waiting for the councilling. Now i am in a dilemma whether to take ... A: India is growing economy and especially in high technology areas. There are going to be many good ... | |
| power engineering | 7/8/2009 |
| Q: Sir, At what voltage does generation of electical energy takes place in power plants?on what ... A: The question is not clear to me. If you are asking about generator output the answer is they will ... | |
| generatore to motor attech | 7/5/2009 |
| Q: respected sir can i rotat an alternator of 375Kw 11Kv and 6 pole with an electric motor of 200 hp ... A: Yes, but not to full power. You still need 500 HP motor in order to run the generator to full ... | |
| generatore to motor attech | 7/3/2009 |
| Q: respected sir can i rotat an alternator of 375Kw 11Kv and 6 pole with an electric motor of 200 hp ... A: You can rotate it, but you would not be able to get out the full 375Kw. Why? The motor you are ... | |
| electric motor control | 7/2/2009 |
| Q: I want to reduce the speed of my saw motor (120V, 15 amp) to allow the use of a special blade. Can ... A: Here is an interesting discussion about the type of motor you may be referring to. Please read ... | |
| regading electrical | 7/2/2009 |
| Q: to control the traffic in road using microcontroller or some other means ANSWER: Yes, wonderful. ... A: Here are some ideas: http://ops.fhwa.dot.gov/Weather/best_practices/CaseStudies/016.pdf ... | |
| laptop charger | 6/29/2009 |
| Q: good day sir,sir i am working on a laptop charger that will get charged through a cigarette lighter ... A: Well, if the design is correct and working like a battery charger should, to get more current you ... | |
| Capacitors for home electrical spikes | 6/28/2009 |
| Q: Sir, does anyone market a capacitor that could be plugged into a standard 110v outlet to capture ... A: Well, it takes more than a capacitor to "capture" energy spikes. Tell me what conditions you are ... | |
| i need a solution | 6/25/2009 |
| Q: Sir. I am writting a project and i want know if it possible to increase current in 950VA generator ... A: Yes, of course. But the question is at what cost and effort are required. The VA ratings are ... | |
| project that is computer related | 6/24/2009 |
| Q: i want help on how to find M.Sc research topic in electronics engineering but that is computer ... A: There are many project ideas on the internet. You can use google or bing.com to find them. You can ... | |
| Finding inductance | 6/22/2009 |
| Q: I want to measure the inductance of an electro magnetic coil. It is a dc coil and I have rectifier ... A: Yes, that is one way, but you must know the internal dc resistance as you note. If the resistance ... | |
| Microcontroller programming | 6/22/2009 |
| Q: I have a microcontroller and I want to make a connection with a Wi-Fi module. Do I have to implement ... A: Yes. If you want to communicate it must be digital stream compatible. Why not just purchase a Wi-Fi ... | |
| MCB's | 6/17/2009 |
| Q: cleggsan, i wonder about mcb's what is the main difference between 1P+N(1 Phase and neutral opens ... A: May I refer you to this informative web page and its many discussions in the below section. ... | |
| Delta/delta transformer protection | 6/15/2009 |
| Q: What is the best way to protect the output circuit of 11.5kv/0.480kv delta/delta 3 wire system ... A: Here is a discussion in a textbook on the general subject that may be of interest to you: ... | |
| harmonics filter low voltage | 6/14/2009 |
| Q: I'm doing a final year project on harmonics control in low voltage applications such as analyzing ... A: Here is a TI sheet on their 60Hz notch filter using their UAF42: ... | |
| Switchmode Power Supply rating | 6/13/2009 |
| Q: I bought a USB charger that provides 5V for any device with a USB port. It is rated at 300mA. Does ... A: Supply will give 5v up to 300ma; if load requires more draw the voltage will fall off because it ... | |
| Thermal analysis | 6/12/2009 |
| Q: We are currently building a 200W,10A dc-dc converter with and are planning to put it in a box. Since ... A: You are right in the middle of Philips country - Eindhoven! They have engineers that do these kinds ... | |
| typical type = feeder type or ACB size? | 6/12/2009 |
| Q: hey there i'm just wondering. i'm checking the typical type of a single line diagram against a ... A: Sorry, I don't have an answer on this one. I wouldn't want to mislead you with even an educated ... | |
| Voltage available but cannot use it | 6/11/2009 |
| Q: Had two fully charged 24v batteries for my drill. While using it, it suddenly stopped. I thought it ... A: Yes, fully charged it should read a little higher than the 24v rating. The best way to tell if ... | |
| Voltage available but cannot use it | 6/11/2009 |
| Q: Had two fully charged 24v batteries for my drill. While using it, it suddenly stopped. I thought it ... A: Testing batteries is done by placing a load on it whilst taking the voltage measurement. Often, the ... | |
| Induction motor power consumption calculation | 6/10/2009 |
| Q: I want to do calculations on power consumption of a three phase induction motor. I need help on how ... A: See: http://users.tpg.com.au/users/robkemp/Power/CalculatingConsumption.htm See: ... | |
| solar panel to a fridge for my beach hut | 6/9/2009 |
| Q: im a bit stuck with the idea i have a mobicool fridge that has a power consumption of 72 watts and i ... A: One: The little fridge draws power at a different rate each time the compressor goes on. Then, if ... | |
| Elecric Motor | 5/24/2009 |
| Q: We are in a new project, some motors do not require solo run test such as: OILY WATER SUMP PUMP ... A: My opinion is: "But for continuously running application where heat can build up quickly the solo ... | |
| 60Hz appliances on 50Hz supply | 5/24/2009 |
| Q: coffee maker, blender, toaster/toaster oven, lamps, and fans on the 50Hz supply in Bangladesh? They ... A: See this site for comparisons, including connector/plugs. http://www.kropla.com/electric2.htm ... | |
| Elecric Motor | 5/20/2009 |
| Q: We are in a new project, some motors do not require solo run test such as: OILY WATER SUMP PUMP ... A: Sump application are usually intermittent running; that is they run for a few seconds or minutes ... | |
| Power Transformer | 5/20/2009 |
| Q: Some of our power oil transformer have variable MVA (ex. 2.75/3.125 MVA) and the others do not (ex. ... A: You would need to look at the specifications from the manufacturer. It could be for many reasons ... | |
| Fuse | 5/19/2009 |
| Q: If a fuse is rated a 2 amp at 125 volts would the same fuse be rated 2 amp at 36 volts? In other ... A: Not in a tragic way. But, the fuse melting point is a function of the power being dissipated in the ... | |
| guitar amps | 5/18/2009 |
| Q: i have a solid state 4 ohm combo amp and a marshall 50/25 whatt half stack (cab is 8 ohms) and i ... A: Switching the amplifier that is feeding the speaker system must be done at the speaker line or ... | |
| Coaxial Cable interference | 5/17/2009 |
| Q: I have a 75Ohm coax running to a TV. It runs past a desktop PC and I have noticed that when the PC ... A: I doubt if cable is the problem. Just move the cable a little and see if it alters the signal that ... | |
| generator GFI | 5/15/2009 |
| Q: Installation: we will be staging a show production on a job site. There will be five Generators - ... A: I don't know the answer. First requirement, it seems to me, is to make sure it is safe and there is ... | |
| Micro LEDs | 5/14/2009 |
| Q: I am wondering what the smallest LEDs available are? I have been told that LEDs can be incredibly ... A: If the quantities are sufficient the vendor would make them to your specification. If you are ... | |
| Micro LEDs | 5/14/2009 |
| Q: I am wondering what the smallest LEDs available are? I have been told that LEDs can be incredibly ... A: Here is a really small LED that is commercially available: ... | |
| Meggering | 5/12/2009 |
| Q: What is the proper word of "meggering" in terms of Electrical engineering? and what results must you ... A: This is a test to find leakage on high tension and transmission lines and on big electrical ... | |
| High Voltage Power Line and Helicopter | 5/11/2009 |
| Q: The helo is not grounded I would guess. Why is there any current flow between the helo and the line? ... A: Well, not to repeat my self, but there must be a conductive path in order to see the sparks fly; in ... | |
| High Voltage Power Line and Helicopter | 5/11/2009 |
| Q: The helo is not grounded I would guess. Why is there any current flow between the helo and the line? ... A: The video clarifies the question! Thanks. But, the answer remains the same. The sparks flying are ... | |
| High Voltage Power Line and Helicopter | 5/10/2009 |
| Q: The helo is not grounded I would guess. Why is there any current flow between the helo and the line? ... A: Is there a question here? If you are asking if there is current flow when an object crashes into a ... | |
| I need your help sir.. | 5/10/2009 |
| Q: 1 .May I know the advantages of rc coupling and transformer coupling? 2. May I know the function of ... A: 1. It is almost entirely application specific. Only universal advantage is RC is less costly than ... | |
| UL approval | 5/9/2009 |
| Q: I'm considering buying a specialized therapeutic heat lamp which is not UL approved. The more ... A: The FDA 510k mark is a premarketing label but I could not find it on the FDA search for that model - ... | |
| UL approval | 5/9/2009 |
| Q: I'm considering buying a specialized therapeutic heat lamp which is not UL approved. The more ... A: I was hoping you had given the make and model so I could give you a more specific reply. However, ... | |
| Lowering utility bill using a capacitor | 5/7/2009 |
| Q: I have done a little research on lowering a utility bill through the use of a capacitor. Your answer ... A: I guess it depends on what you call a scam. If the capacitor will lower your electric bill so ... | |
| cd players | 5/6/2009 |
| Q: i have a fairly new magnavox 5 disc carousel cd changer cd player and the transformer went out. i ... A: Magnavox and Onkyo are totally different manufacturers. The chance that the two power transformers ... | |
| car power inverters | 5/6/2009 |
| Q: I was wondering if I could use two separate 160 watt power inverters in separate DC receptacles ... A: If you place too much load on the inverter it will collapse or time out. The idea of the car fuse ... | |
| car power inverters | 5/5/2009 |
| Q: I was wondering if I could use two separate 160 watt power inverters in separate DC receptacles ... A: Well, the problem is the power drawn from the inverter is not pure non-reactive power due to the ... | |
| Converting Jack Hammers 50hz to 60hz | 5/5/2009 |
| Q: Im hoping you can give me answer. My Dad purchased 30 small jackhammers out of china,and they are ... A: Well, I am not so sure that is the problem. The difference in frequency should not seriously effect ... | |
| Toshiba 2535DB CRT TV | 5/4/2009 |
| Q: I recently aquired a toshiba 2535DB CRT TV which seemed to work fine until I hooked it up to a DVD ... A: SCART connections are not all the same. There are a couple of pins designated for different ... | |
| Earthing design | 5/4/2009 |
| Q: I'm building a Earthing/grounding rod lighting system. for a 4.9m antenna on the roof of a building ... A: I am not clear expert on this type of earth/ground. This is a little complicated because of the ... | |
| Toshiba 2535DB CRT TV | 5/3/2009 |
| Q: I recently aquired a toshiba 2535DB CRT TV which seemed to work fine until I hooked it up to a DVD ... A: It is obviously not switching out of SCART1 whilst adding terrestial to the signal as well. It is ... | |
| hdtv r-f composit input signal to home tv. | 5/3/2009 |
| Q: WHAT DOES THE HDTV INPUT SIGNAL LOOK LIKE COMPARED TO OLD ANALOG RF INPUT.OLD SYSTEM USES AM ... A: This is a very complicated matter; the technology of High Definition is totally different from ... | |
| relativistic physics | 5/1/2009 |
| Q: why speed of light in all inertial frames is same? A: Einstein's theory of relativity says: "The speed of light in a vacuum is the same for all ... | |
| earth pit design | 4/29/2009 |
| Q: I want to make earth pit, so far i could understand it could be made in two types, 1> digging deep ... A: Please see an old question/answer from a couple of years back which may be of interest to you: ... | |
| ammeters | 4/28/2009 |
| Q: who invented it, how it works and what does it do? A: An Ammeter or "amp meter" is for measuring current in an electric circuit. According to ohms law ... | |
| electrical engineering | 4/27/2009 |
| Q: how much do you earn a month as an electical engineer A: It greatly varies from country to country and from city to city as well as the field that you are ... | |
| convert 3 wire 240v to 2 wire 240v | 4/27/2009 |
| Q: I am hooking up electric water pump. I have a 3 wire 240 circuit coming from the breaker panel (red, ... A: Sorry, this is a wiring question, not an engineering question. I will refer you to another ... | |
| DC MOTOR | 4/25/2009 |
| Q: DC MOTOR having constant speed no effect on load, ANSWER: What is the question? If you are asking ... A: The web page below may be instructive for you: ... | |
| DC MOTOR | 4/24/2009 |
| Q: DC MOTOR having constant speed no effect on load, A: What is the question? If you are asking if there are dc motors that retain constant speed with a ... | |
| apparent convergence problem Samsung HCM5525W TV | 4/24/2009 |
| Q: I have curved lines at the top of my rear projection Samsung TV. When I try the autofocus routine ... A: P/N BP95-005-00415H is, indeed, the convergence board and I give it a chance of good results - if ... | |
| RE: (No subject header) | 4/23/2009 |
| Q: what regulated and unregulated power supply A: What is your question? A regulated supply has an electronic circuit that holds the output voltage ... | |
| electric | 4/23/2009 |
| Q: whether there can be more than 3 ground wires in electrical transmission poles, if so why A: Not sure I understand the question, but let me try. I suppose you can have as many ground wires as ... | |
| electrophoresis power supply | 4/22/2009 |
| Q: I have a Pharmacia electrophoresis power supply, model eps 500/400 with digital display. I want to ... A: The electrolytic cap you described is three caps in one can, commonly used in power supplies of old ... | |
| Emitter Follower Class A output stage | 4/22/2009 |
| Q: Refer to the attached circuit Given beta = 1000, V-CESAT = 0.4V and RL = 4 ohmDetermine the minimum ... A: Don't do homework type problems here, but you can do this on your own. For class A amplification ... | |
| electrical and electronics | 4/21/2009 |
| Q: presently i am working on power conditioner equipments like svc,Dvr,d-statcom,UPQC...etc and i heard ... A: Please read through the section of this book below which will outline its advantages and how they ... | |
| DC MOTOR | 4/20/2009 |
| Q: Sir i want to make DC MOTOR. A motor if i give a voltage of 5v to motor and motor runs at 50rpm, ... A: I must know more. ONE: What kind of dc motor are you thinking of? Brush type or brushless? ... | |
| Voltage balance while running three phase motor on single phase using capacitor | 4/20/2009 |
| Q: When I run three phase AC induction motor(5hp to 15hp) on single phase using capacitor, I get ... A: I understand your question clearly. I don't, however, have a clear answer for you. Why? Because ... | |
| Electrical cable sizing | 4/19/2009 |
| Q: I need to install a Titan water heater. they recommend a 2x50 amps breaker, and #8 wire; however, ... A: This would be the Tempra 20, right? It runs on 208v and as you say recommends 2 x 8 gauge wiring. ... | |
| Latent Defects | 4/16/2009 |
| Q: I am doing an introductory course into manufacturability. Could you please give me a couple of ... A: Check this page out: ... | |
| braking dc motor | 4/15/2009 |
| Q: It's me again. Hope you arent annoyed with my questions. This time I have question about braking a ... A: Got it. Yes, you are right, the mechanical inertia will be converted into heating power and ... | |
| braking dc motor | 4/14/2009 |
| Q: It's me again. Hope you arent annoyed with my questions. This time I have question about braking a ... A: Yes, motors constructed conventionally - you will have to decide if that it the case for your motor ... | |
| braking dc motor | 4/14/2009 |
| Q: It's me again. Hope you arent annoyed with my questions. This time I have question about braking a ... A: http://www.electricmotors.machinedesign.com/guiEdits/Content/bdeee3/bdeee3_1.aspx ... | |
| North American audio amp to run on Russian Power source | 4/13/2009 |
| Q: I need to adapt my 120v., 60hz vintage USA tube audio amplifier to run on European current. Will the ... A: Power in most Russian cities is 220v @ 50 Hz. To run a USA product as you mentioned it will require ... | |
| Electronic Principles | 4/13/2009 |
| Q: Voltage is given by the following expression: v = 100 sin314t + 50 sin 942 t – 40sin1570t is ... A: Sorry; can't do. Either it is a trick question (home work assignment) or all information is not ... | |
| power electronics | 4/11/2009 |
| Q: i have many questions : 1-how can i remove the effect of back emf in rectifiers? 2-explain the major ... A: Yes, you are correct; it is many questions. Too many for one day! This is actually a textbook set ... | |
| electrophoresis power supply | 4/10/2009 |
| Q: I have a Pharmacia electrophoresis power supply, model eps 500/400 with digital display. I want to ... A: If one meter shows current and another doesn't that indicates the high probability one of the meters ... | |
| power factor | 4/9/2009 |
| Q: AS I add compact flourescent lamps to my home how much do hey effect my power factor. Is it a ... A: CFL or compact fluorescent lamps have a power factor in the range of .5 to .6 depending on the maker ... | |
| impedance matching of non-resonant antenna | 4/7/2009 |
| Q: How do I go about matching the impedance of a non-resonant antenna ? eg: I have a monopole antenna ... A: Here is a tutorial on antenna matching that is helpful: http://www.k0bg.com/match.html Since I am ... | |
| Regulated Power Supply | 4/5/2009 |
| Q: I have noticed that a lot of appliances (in particular electonic keyboards) use unregulated power ... A: Most of the product that are powered by a pod off the ac line actually work with some lower voltage; ... | |
| Determining Generator Output | 4/1/2009 |
| Q: What output (watts) can I get from a generator run off a water wheel that generates 1860 lb.ft. of ... A: Look here for an overview of the subject matter: http://en.wikipedia.org/wiki/Horsepower and ... | |
| SCR | 4/1/2009 |
| Q: Could you please explain me in detail the significance of Short Circuit Ratio (SCR) in an Electrical ... A: SCR: Stephen J. Chapman's Electric Machinery Fundamentals page 287. It says: Short Circuit Ratio ... | |
| fluorescent tube light | 3/31/2009 |
| Q: I have a question about fluorescent tube light. We usually watch that using tube light for many days ... A: Go to this page: http://en.wikipedia.org/wiki/Fluorescent_lamp and down about half way there is a ... | |
| Earth fault | 3/31/2009 |
| Q: Sir/Madam I want to know that what is a earth fault exactly and what is the difference between earth ... A: These are power engineering terms. I refer you to: ... | |
| Air Sucker & Blower | 3/30/2009 |
| Q: I bought an AC-powered blower. But i want the fan to suck air, instead of blowing. I need a strong ... A: ONE: Turn the blower around. If it is blowing, it must suck air in from the other side. Many ... | |
| Emergency stop | 3/30/2009 |
| Q: How many E stop categories are there? And would you give me an example of each category? Thank you. ... A: This is a trick question. Right? There are too many types of E Stops in the world to dig into in ... | |
| DSP | 3/28/2009 |
| Q: Calculate 8 point DFT of x(n)= 1 ,for -3<=n<=3 0 ,otherwise problem ... A: I don't do homework but here is where you can get a complete explanation of the discrete fourier ... | |
| electronics and communication | 3/27/2009 |
| Q: why the bandwidth of square wave is greater than sine and triangular wave? A: Have you had fourier analysis? Or upper math classes on repetitive waveform analysis? That is the ... | |
| resistors in parallell | 3/25/2009 |
| Q: resistors of 20 ohms 40 ohms and 60 ohms connected in parallel.the total resistance value will be ? ... A: Your answer book is correct. Here is the process: 1/20 = .05 1/40 = .025 1/60 = .0166666 Total= ... | |
| LED load cell | 3/24/2009 |
| Q: I'm an artist working on a public work proposal for a major property developing company in London. ... A: There are many types and implementations of load cells. Most of them are strain gauges that are in ... | |
| Transformer | 3/23/2009 |
| Q: Why we use transformer rating in voltampere and in kilovoltampere? explain in detail. A: Oh my goodness; you are getting lazy. You can google for simple fundamental principles like this ... | |
| laptop plag/charger | 3/22/2009 |
| Q: i had my laptop repaired and the guy gave me different plug/charger. i wanted to know if this ... A: Did you wonder why or ask why you received a different charger? Was there a problem with the ... | |
| dc motors | 3/20/2009 |
| Q: what is the use of series motor? where it can be used? A: Principle of operation; http://www.tpub.com/content/neets/14177/css/14177_58.htm Their ... | |
| SCART audio and video | 3/19/2009 |
| Q: I send composite video from my DVD player to my TV via a single phono lead and audio via a stereo ... A: For short distances the phono type cable will be alright, but technically, it should be a video ... | |
| Needed Alternator output for AC | 3/17/2009 |
| Q: I am trying to run a 120volt ac roof top A/C from my boats alternator supplying current to a 2000 ... A: Good Luck. I hope it will work. The start up current of air conditioners is quite high when they ... | |
| SCART audio and video | 3/16/2009 |
| Q: I send composite video from my DVD player to my TV via a single phono lead and audio via a stereo ... A: It may be the scart converter that needs video to trigger the processor on. Try these: ... | |
| resistance | 3/14/2009 |
| Q: WHY IN PARALLEL CONNECTION THE TOTAL RESISTANCE IS SMALLER THAN THE SMALLEST RESISTANCE IN THE ... A: Parallel resistors have a final equivalent resistance equal to the reciprocal of the sum of the ... | |
| solar poweredlight bulb | 3/13/2009 |
| Q: I want to make a solar cell that can produce enough energy to power either a LED or light bulb. ... A: There are several approaches you can consider. Most commercially available units are the ... | |
| LCD and Plasma Screen Flicker | 3/12/2009 |
| Q: I know that a CRT TV has a flicker rate (50Hz here in the UK and interlacing) but I was wondering... ... A: Yes, wear can be a matter of concern in the small, inexpensive devices that are used for displays ... | |
| LCD and Plasma Screen Flicker | 3/11/2009 |
| Q: I know that a CRT TV has a flicker rate (50Hz here in the UK and interlacing) but I was wondering... ... A: You are right about "flicker" or more precisely persistence. In the case of crt, the material on ... | |
| faraday law | 3/11/2009 |
| Q: general application of faraday's law.easy way to apply in general life.some about transformer A: I refer you to this tutorial for your review: ... | |
| encoder: CPR or Max. revolution | 3/10/2009 |
| Q: I have 2 datasheets from two different encoder. In the 1st datasheet, it says 1000 counts per turn. ... A: I don't know your application so I will have to guess..... Counts per turn is generally referred to ... | |
| Relay contacts and Skin effect | 3/9/2009 |
| Q: how should a set of relay contacts that are rated for 5 Amps at 230V Ac/50 60 Hz be derated for use ... A: We need to know the load conditions (resistive or reactive) and current levels in order to know for ... | |
| Faulty TV | 3/9/2009 |
| Q: The TV turns on but it only comes up with a plain white screen and no functions on the remote work ... A: Well, all tv sets can be repaired. The question is whether it is an economical process or not. ... | |
| project writting | 3/5/2009 |
| Q: the purpose of estimation, specification, proposed drawing and execution in project writting based ... A: What is your question? In the contract field it is always important to have a full set of ... | |
| capacitor match | 2/22/2009 |
| Q: I'm attempting to repair an electronic device and need to purchase a replacement capacitor. I am ... A: I would need to know the circuit this capacitor is going into to give you a good answer. Also, the ... | |
| No green convergence adjustment. | 2/20/2009 |
| Q: I have a Toshiba Model TP48D90 and have been having convergence issues. I have replaced the stk ... A: I think it is still the convergence circuit. If you used those cheap/inexpensive STKs (the $6 or ... | |
| Lamp code number | 2/19/2009 |
| Q: I have the 2004 and I can not located the number to the lamp code on the sticker located in the ... A: You have the 2004 what? Are you talking about LCD TV lamps? ... | |
| rectifiers | 2/19/2009 |
| Q: sir, can i connect a dc motor to a ac -dc rectifier without a capacitor across its ends?? will the ... A: Need more information about the motor and the rectifier. In most cases it would run but it may not ... | |
| Push Button Tactile Switch | 2/16/2009 |
| Q: I have two mini push button tactile switches one of which I want to use in a automotive application ... A: I would think not. At least not for short term use. If it is really heavy duty and the current ... | |
| Push Button Tactile Switch | 2/15/2009 |
| Q: I have two mini push button tactile switches one of which I want to use in a automotive application ... A: It is totally dependent on the circuit you are activating. If the switch is a spst normally open ... | |
| Amplifier | 2/15/2009 |
| Q: Why an Amplifier should have large input impedance? A: So it can be driven by a simple voltage preamplifier. The most commonly used standard is for the ... | |
| sw antenna | 2/13/2009 |
| Q: for my sw radio, i put up an aluminium pipe of 5metres as antenna. i didn have wire, so used it. ... A: Well, I need the make and model of the radio to give you guidance for that radio; not all SW radios ... | |
| Electrical Principles | 2/12/2009 |
| Q: A coil has a reactance of 50 ohm and a resistance of 8 ohm when connected across a 115v, 400Hz ... A: This is really basic electronic math. Since it sounds like a student question I will give you the ... | |
| antenna | 2/12/2009 |
| Q: i have an old radio which has MW SW1 SW2. which band corresponds to nearer stations, which band to ... A: Neither. The MW is lower frequencies, the SW bands are higher frequencies. Antenna is a function ... | |
| modbus communication | 2/11/2009 |
| Q: i want send a data to modscan32 via cp340 having rs485 port and it act as modbus slave so is there ... A: Sorry, I do not know the answer to your question; it is not an area that I am familiar with. ... | |
| hlr6768w | 2/9/2009 |
| Q: i put in new lamp tv worked for 7 days.stop working. put in new ballast tv work for 6 days stop ... A: Did you replace the lamp with the correct one and did it get seated properly as outlined in the ... | |
| Kilovolt-Ampere Rating | 2/8/2009 |
| Q: HOW DO YOU RATE THE FOLLOWING AS kVA: 36 "SHARP" SOLAR PANELS(NT-175UI), EACH PRODUCING 175 WATTS ... A: The panel produces 175 watts nominal (which is 175 volt.amps or 0.175 kva.) And UL is saying you ... | |
| abt summer training | 2/7/2009 |
| Q: sir, can u enlighten me regarding knowledge of summer training th engg students do in sec yr of ... A: Can you tell me what country you are in and what field of study is interesting to you? There are so ... | |
| ham radio | 2/6/2009 |
| Q: I'm doing my bachelors in Elec and Comm. I would like to become a ham and later on create awareness ... A: General: http://en.wikipedia.org/wiki/Amateur_radio_in_India India Net: http://hamradioindia.net/ ... | |
| Audio engineering advice | 2/6/2009 |
| Q: I'm looking for advice instead of a technical dilemma. I graduated last spring with an AAS degree in ... A: Keep reading. That is the way to forge ahead always. It is very hard to find employment in the ... | |
| dc generator | 2/5/2009 |
| Q: When considering the output power of a rotating shaft dc generator, is it accurate to think of the ... A: Of course. Torque is what produces rotation. Rotational speed or rpm determines the rate at which ... | |
| dc generator | 2/5/2009 |
| Q: When considering the output power of a rotating shaft dc generator, is it accurate to think of the ... A: http://www.tpub.com/neets/book5/15.htm The above is a simple theoretical analysis of the generator ... | |
| Office lighting | 2/4/2009 |
| Q: Storage room with 2' deep shelves along three walls. 5' wide x 10' long with a 9' ceiling. Walls and ... A: Please refer this question to one of the experts at: ... | |
| 4-20mA to 2 digital ouputs converter | 2/4/2009 |
| Q: I am new in instrument field. I am working on a project which needs 2 digital outputs programmable ... A: Let me refer you to my colleague who is an expert on ... | |
| Walkie Talkies | 1/21/2009 |
| Q: I will be traveling to Dominican Republic and would like to purchase a set of Walkie Talkies to ... A: ONE: Yes they will work. TWO: The DR uses the same frequency allocation as the USA by virtue of ... | |
| TV Screen control | 1/18/2009 |
| Q: Am I right in thinking that adjusting the screen control on the flyback transformer adjusts the ... A: Make and model number is necessary to give a precise answer. The age of the set is critical because ... | |
| CT Can | 1/18/2009 |
| Q: My home, an 1800 sq. foot dwelling, had a ct can attached to it when it was built. I have had very ... A: You leave me guessing because I have no idea what kind of residence you have, what kind of wiring, ... | |
| CT Can | 1/17/2009 |
| Q: My home, an 1800 sq. foot dwelling, had a ct can attached to it when it was built. I have had very ... A: What do you mean by ct can? Are you talking about a transformer on the pole outside the home? If ... | |
| relays | 1/16/2009 |
| Q: i energised a 12V 30A relay directly from a 7812 - without any load. after sometime, the relay ... A: It is very simple: If the relay gets hot it means the power into it is too much. That is assuming ... | |
| 12V DC LED | 1/16/2009 |
| Q: In a pervious email you suggested using a resistor in series to turn off a normally open a spst ... A: It is not the current rating of the switch that is important but the current rating of the LED! ... | |
| electrical safety | 1/15/2009 |
| Q: i'm running a pair of three 18-gauge single strand PVC insulated copper wire from my water level ... A: Can't give you a difinitive answer because the circuitry is an important component of the system. ... | |
| Wiring a tact switch | 1/15/2009 |
| Q: I have a 12VDC single pole single throw tact switch that I want to use to turn on and off an LED. I ... A: How about this: Use a 6v LED. Put a resistor in series between the LED and the 12v source; then ... | |
| Wiring a tact switch | 1/14/2009 |
| Q: I have a 12VDC single pole single throw tact switch that I want to use to turn on and off an LED. I ... A: 1. OK, the LEDs are already built for 12v direct connection. Good. 2. You need a switch that is ... | |
| limiting power input | 1/14/2009 |
| Q: Gas golf cart with newer 12 v. auto battery. Has a starter/generator and a voltage regulator and ... A: That is a strange problem for the golf cart to allow the voltage to go so high when the lights are ... | |
| job help | 1/13/2009 |
| Q: what college should i go to study in computer programming i was thinking itt technical institute i ... A: Practically every 4 year college or university has a computer course. There are several levels of ... | |
| Wiring a tact switch | 1/13/2009 |
| Q: I have a 12VDC single pole single throw tact switch that I want to use to turn on and off an LED. I ... A: http://unclean.org/howto/led_circuit.html http://www.kpsec.freeuk.com/components/led.htm The sites ... | |
| Transformer with open circuit secondary | 1/12/2009 |
| Q: When I open circuit the secondary winding of an ideal transformer do I just see an ideal inductor ... A: Yes, but an open secondary in the ideal presents a very high impedance. In the perfect, ideal case ... | |
| Science project | 1/12/2009 |
| Q: I am doing a science project about the conductivity of different liquids and I was wondering what ... A: http://jchemed.chem.wisc.edu/jcesoft/cca/CCA1/R1MAIN/CD1R3230.HTM ... | |
| rheostat for testing 12V DC circuits | 1/11/2009 |
| Q: I want to make a device for testing auto sensor feedbacks to the ECM. I would like to take a 12-13 ... A: Without the current requirements it cannot be calculated. Ohms law is Voltage = Current times ... | |
| Ceiling fan with light wiring | 1/11/2009 |
| Q: Removed an old ceiling fan with light that was operated by two switches. There is only 1 black 1 ... A: See: http://www.control.com/1026198845/index_html and ... | |
| 60hz appliances in a 50hz world | 1/10/2009 |
| Q: Help! I am in the process to relocating to S.Africa. I am a food/wine writer and gourmet cook and ... A: It is more important to match the voltages, of course. In South Africa the power is 220v at 50Hz. ... | |
| coils winding | 1/10/2009 |
| Q: If I build an electromagnet,can i wind the coil in one direction,and then back on itself - to build ... A: Yes, you can wind one coil over or on top of another. The only difficulty is the farther away the ... | |
| transformers | 1/9/2009 |
| Q: I was wondering what kind of equipment I would need to power a residential area. A: What is a residential area? One home or several homes? And daytime or nighttime? A typical house ... | |
| U.S to Europe voltage convert | 1/9/2009 |
| Q: I have purchased a microwave oven(Sharp R-7276)from the United States some years ago,with input ... A: There are many electrical shops in Athens where you can buy a step down or step up transformer. ... | |
| science fair | 1/8/2009 |
| Q: I am entering my 6th grade science fair and I want to know if there is something I can make to ... A: Yes, a small motor/generator can do this and there are many small fractional horsepower motors that ... | |
| current transducer | 1/7/2009 |
| Q: We are building a MPPT charger. We use a LEM HXS 20-NP/SP3 current transducer to measure the ... A: I don't know the cost of the current devices nor the project resources or how many chargers you are ... | |
| Harmonic filtering | 1/7/2009 |
| Q: Why is it that only the prime odd numbered harmonics are filtered? Ie why are the others not ... A: A distortion analyzer will easily tell you what harmonics are contained within the waveform and how ... | |
| current transducer | 1/6/2009 |
| Q: We are building a MPPT charger. We use a LEM HXS 20-NP/SP3 current transducer to measure the ... A: Well, the LEM HXS 20-NP/SP3 is a Hall effect transducer. ... | |
| Harmonic filtering | 1/6/2009 |
| Q: Why is it that only the prime odd numbered harmonics are filtered? Ie why are the others not ... A: Oh. That is an entirely different matter. Could you tell me which kind of network you are ... | |
| heaters | 1/5/2009 |
| Q: i have a small 2kw fan heatet and i'm thinking of buying a 2kw convector or oil heater. now is ... A: Watts are watts and in a heater the "watts" are dissipated in the form of heat - that is what watts ... | |
| Harmonic filtering | 1/5/2009 |
| Q: Why is it that only the prime odd numbered harmonics are filtered? Ie why are the others not ... A: They are. You can filter any harmonic that you want. In passive RLC filter networks they are ... | |
| Sony Trinitron KV-32TS46 | 1/4/2009 |
| Q: Yes I know this is a 15 year old set, but the picture is still good. Unfortunately, the audio ... A: OK. If the buzz is in the audio coming out of the tv audio output than it is probably coming from a ... | |
| Energy saving with capacitor | 1/4/2009 |
| Q: I have been engaged with a salesman for a energy audit co that is telling me as a homeowner i will ... A: Yes, it is an old scam that his been going around for along time. The idea is that it corrects the ... | |
| Sony Trinitron KV-32TS46 | 1/3/2009 |
| Q: Yes I know this is a 15 year old set, but the picture is still good. Unfortunately, the audio ... A: Here is my suggestion and it is not too costly. If the set has an audio output on the back of the ... | |
| Where can I find a list of the electric voltage of every state in US? | 1/2/2009 |
| Q: I have found an article about Electric Current Abroad on the website of ITA. But it doesn't include ... A: Standard single phase higher voltage in the USA to residential is 220v ac, or one leg of the 3-phase ... | |
| parking sensors | 1/1/2009 |
| Q: Sir, I jus need a basic idea on, how a car parking sensor works, and also it's range ? A: Most of them work on ultrasonic audio, a high frequency acoustic signal that is bounced off the ... | |
| Electronic Engineering Schools | 1/1/2009 |
| Q: I have a great interest in repairing and building Guitar amplifiers someday and to get the ball ... A: I strongly recommend you to follow, at least for the first several courses, the basic electrical ... | |
| Where can I find a list of the electric voltage of every state in US? | 12/31/2008 |
| Q: I have found an article about Electric Current Abroad on the website of ITA. But it doesn't include ... A: In the USA the standard power for home/residential is 120v @ 60hz. It is uniform throughout the usa ... | |
| UPS power consumption? | 12/27/2008 |
| Q: I have an APC BackUPS BK650ML hooked up to my PC due to constant power failures in my country. I am ... A: Please refer to the power discussions in the manual for one similar to yours. You can find it at: ... | |
| I have a 20in tv that the color is off.? | 12/26/2008 |
| Q: I tried to change the reds and greens but everything is like a purpleish-blue color the tv is a ... A: The description of the symptoms leave me guessing. I am going to wager it is a magnetization of the ... | |
| Li-Ion | 12/19/2008 |
| Q: Why are there 3 connections on phone and computer batteries. Is one a sense line? Regards Mac ... A: Most of them use the third wire as a charging line. In other words, one lead is ground, one lead is ... | |
| Capacitor's Capacitance drops with voltage | 12/19/2008 |
| Q: I was recently told that a capacitor rated at say 2nF only had that capacitance at 0V and when a ... A: It is quite dependent on the materials used and the mounting. If the distance between the plates ... | |
| project | 12/18/2008 |
| Q: I am a final student of electrical engineering, Nnamdi Azikiwe university, Awka. ANAMBRA STATE. ... A: You must determine your interests, your course backgrounds, the professors inclinations and your ... | |
| Yamaha amplifier volume control switch | 12/17/2008 |
| Q: I acquired an older Yamaha amplifier. Overall I am pretty happy of the performance, except that the ... A: The Alps potentiometer is a standard off-the-shelf replacement type control. However, it does not ... | |
| electrical engineering in music | 12/16/2008 |
| Q: I'm about to embark on getting a degree in EE to work in the music field and was wondering if you ... A: When you say "music field" that invokes a very wide range of applications. There are many who want ... | |
| Electrolytics that leak | 12/16/2008 |
| Q: I have been a TV Tech for a long time and I have noticed that when Electrolytis have excessive ... A: It is due to the construction usually. When in a metal can the negative foil is on the outside. ... | |
| Power distribution between dislike speakers | 12/15/2008 |
| Q: I asked Dave this question, but your system did not like the omega symbol from windows charmap, so I ... A: The wattage ratings are quite meaningless; you can ignore them. What you need to look at is the ... | |
| TV Settings | 12/15/2008 |
| Q: After recently repairing a TV set I have noticed that after the TV has been running and is switched ... A: It is probably magnetization of the screen. The shadow mask inside the picture tube has been ... | |
| TV Settings | 12/14/2008 |
| Q: After recently repairing a TV set I have noticed that after the TV has been running and is switched ... A: Would you be kind enough to give me the make, model and year of the tv and describe for me the ... | |
| Load Sharing | 12/13/2008 |
| Q: Sir, if i have a power plan A with 2 generator work in parallel and there is load sharing ... A: Sir, I do not know about this matter. Sorry. But, if the load sharing software is communicating ... | |
| Full screen TV reception | 12/13/2008 |
| Q: I have 2 wide screen TV's-a Sharp aquos and a 52 inch rear projection Sony. Both have 1080 ... A: It is probably the program coming from the broadcast station. If they are sending it in letter box ... | |
| Pioneer sx-626 | 12/12/2008 |
| Q: Greetings, In setting up an inherited Pioneer sx-626 I found that sound to the right speaker is ... A: Wow, this is old! This model goes way back to the early 1970s! It is a fine old vintage receiver. ... | |
| nominal ampere | 12/11/2008 |
| Q: gdp.m sir im david ,from saudi arabia working in the prominent company here in jubail as the asst ... A: I cannot give you a clear answer. Why? Because there are so many motors in the world with so many ... | |
| Rectifier Output voltage | 12/11/2008 |
| Q: suppose mains voltage is 230Vrms (325V peak) and the transformer converts this to 3Vpeak. If you ... A: Yes, open circuit voltage is always higher because there is no voltage drop across the internal ... | |
| Microwave Oven Safety | 12/10/2008 |
| Q: My microwave is showing some rust at a back inside wall seam. Is this likely to allow dangerous ... A: No. Leakage of the high frequency rays is a function of the size of the opening. If you see the ... | |
| Rectifier Output voltage | 12/9/2008 |
| Q: suppose mains voltage is 230Vrms (325V peak) and the transformer converts this to 3Vpeak. If you ... A: If the ac output voltage is 3v peak it would have a value of 2.12 v ac. The dc output would depend ... | |
| engineering | 12/4/2008 |
| Q: is a commutator used in a ac or dc generator??can you explain your answer? A: Yes. They are used to switch the current direction as the rotor rotates through the 360 degree ... | |
| Opening Car with Mobile Phone | 12/3/2008 |
| Q: I have seen this effect and apparently it works over very long distances. So what happens is you ... A: Nope; according to Snope (pardon the rhyme) which you can find at: ... | |
| photosensors | 11/21/2008 |
| Q: What is a CdS photosensor? A: It is a device that, when light is applied to its surface the resistance changes. It can be used ... | |
| eletrical | 11/19/2008 |
| Q: i wish to understand better the workings of contactors and relays an which connections do what, and ... A: Your question is very broad and I think, from the nature of your question, that you need a ... | |
| capacitors, circuit stability | 11/19/2008 |
| Q: how do i decide on the capacitors required for filtering noise in an electronic circuit? i have ... A: It is much more complicated than that. You must know the circuit parameters and the frequencies ... | |
| induction motor detail | 11/18/2008 |
| Q: we have 100 hp cage induction motor, can we run this motor directly in delta mode without run in ... A: I understand the question, but I don't know the answer clearly. Here are some ideas for you to ... | |
| opamps, relays | 11/18/2008 |
| Q: opamps have high input impedance and so take very less current at their input pins. then say, in a ... A: ONE: While you are generally correct about opamps there are always exceptions to the rule. Some ... | |
| Sizing a UPS for 120VAC motor | 11/17/2008 |
| Q: I want to add an UPS to back-up our 120VAC motor. The motor is a 3/60/230 volt motor but has a ... A: I need to know more about the motor. Is it a 3 phase or not? If it is a 3 phase with option for ... | |
| household appliances UK to US | 11/17/2008 |
| Q: i've purchased a small fortune of kitchen and personal appliances while in the UK (toaster oven, ... A: No. You must use a step up transformer to convert the 110v ac used in the USA to 220 used in the ... | |
| motor wiring | 11/16/2008 |
| Q: i have a 1HP single-phase motor. Inside the motor, there are 2 inputs, P-N. there are 3 wires going ... A: Without reference to which motor model or maker you are referring to I can only give you an educated ... | |
| electrical | 11/16/2008 |
| Q: how to compute size of breaker and size of cable A: In countries with codes or rules for wiring it is more a question of choosing the service needed; ... | |
| RCD | 11/15/2008 |
| Q: In my house the RCD tripped in the consumer unit. The RCD tripped and kept tripping even when all ... A: Yes, there could be current flowing and that could cause the RCD to trip. The current may be due to ... | |
| RCD | 11/15/2008 |
| Q: In my house the RCD tripped in the consumer unit. The RCD tripped and kept tripping even when all ... A: For your reference see this explanation of the RCD: ... | |
| Math | 11/14/2008 |
| Q: how is math used in your field A: Every day, all the time. Electrical Engineering is 99% applied and theoretical math of one kind or ... | |
| dc amps to ac amps | 11/14/2008 |
| Q: I am trying to run a 110volt 5 amp ac motor by useing an inverter that gets its power from a 12 ... A: If the motor is running at 110v AC and pulling 5 A that is equal to 110 times 5 or 550 watts. It ... | |
| Can we Get output from Primary????? | 11/13/2008 |
| Q: I have a doubt in working of a transformer. I will ask with a simple example. I have a ... A: A transformer works on the basis of the turns ratio of the windings. For example if your 24 v ... | |
| low pass filter | 11/12/2008 |
| Q: What is a low pass filter, what does it do in an electrical circuit? Thanks A: A low pass filter is an electronic circuit which allows low frequencies to pass through while ... | |
| Generators | 11/12/2008 |
| Q: How many horsepower input (from a prime mover) is required to generate 1kw of electricity? Or is it ... A: Yes, it is simple enough. If it were an ideal or perfect generator it would require 1.34 HP. Why? ... | |
| Equilize of video signal | 11/11/2008 |
| Q: Classical example: several video signals go to PC quad card inputs through coax. The output is ... A: What happens when you feed just one composite signal at a time into the PC card? What does the ... | |
| Earth Pits and Codes | 11/11/2008 |
| Q: We design a big building, which have 17 generators, 20 transformers and many panel boards. Please ... A: I am sorry but I do not have enough experience in design of these kinds of systems to give you ... | |
| motor control | 11/10/2008 |
| Q: just a quick question,what is meantby "regenerative braking"? thanks A: There are a few meanings within electrical and electronic engineering. But, in the simplest terms ... | |
| capacitor created. how to tackle it? | 11/10/2008 |
| Q: sir/mam, i was building a water level controller(based on water conduction). i'm running two pairs ... A: The capacitance reactance is a function of frequency. The reactance decreases by 1/2 for each ... | |
| microprocessors | 11/9/2008 |
| Q: what is a microprocessor controlled temperature system or a microprocessor temperature controlled ... A: A microprocessor is a computer on a chip. A temperature controlled system is when the temperature ... | |
| capacitor created. how to tackle it? | 11/9/2008 |
| Q: sir/mam, i was building a water level controller(based on water conduction). i'm running two pairs ... A: I doubt if the capacitance of these wires is a factor. Unless the wires are very, very long and ... | |
| transformer | 11/8/2008 |
| Q: i have a burnt CFL bulb's module. there's something like a transformer inside it. is it a ... A: Please refer to this explanation of the construction of the CFL: ... | |
| Pursue Grad School in Engineering | 11/8/2008 |
| Q: I dont have any science problems to solve but a career question..any tips or ideas you can provide ... A: Yes, you can do fine with a math BS. And, yes, EE is 99% applied math. And, yes, you can get ... | |
| megohmmeters | 11/7/2008 |
| Q: when performing checks on a megohmmeter before using it and the leads are touched together and crank ... A: May I refer you to this web page: http://themegohmmeter.com/ The opening explanation indicates ... | |
| HIGH DELTA | 11/7/2008 |
| Q: IHAVE AN 1000KW ONAN/CUMMINS GENSET AND I WANT TO CONNECT IT 480V HIGH DELTA FOR FEED 3 TRANSFORMERS ... A: Normally, yes. If the loading will be symmetrical, i.e., a uniform loading such that the expected ... | |
| Breakers: Ground Faults? | 11/6/2008 |
| Q: I had a question regarding several breakers not tripping. I am working in a sawmill as a electrical ... A: First, do you know for sure the heater is not defective? And, have you checked it for shorts or bad ... | |
| Engineering | 11/6/2008 |
| Q: How is math involve in your field? A: Electrical engineering is about 99% applied math. For example, the most basic relationship ... | |
| LDVT excitation frequency | 11/5/2008 |
| Q: why is the LDVT excited by a sinusoidal voltage in the "frequency range from 60 Hz to 20 kHz" ??? ... A: Ahhh. Very interesting. Are you looking at microminiatures to put inside the vein or from the ... | |
| LDVT excitation frequency | 11/4/2008 |
| Q: why is the LDVT excited by a sinusoidal voltage in the "frequency range from 60 Hz to 20 kHz" ??? ... A: The range is not "exact" in that it is a broadly tuned circuit and it is a range, not a specific ... | |
| generator torque | 11/4/2008 |
| Q: saw some of your responses from a few years ago and thought you might be able to help with this: if ... A: All understood. I am not a wind generator expert. There are many sites that you can google for ... | |
| generator torque | 11/3/2008 |
| Q: saw some of your responses from a few years ago and thought you might be able to help with this: if ... A: I think you are confused between torque, horsepower and overall energy. But, the energy input is ... | |
| generator torque | 11/3/2008 |
| Q: saw some of your responses from a few years ago and thought you might be able to help with this: if ... A: First, let me warn you: I am an electronic electrical engineer, not a power engineer. Mostly, when ... | |
| microwave oven leakage? | 11/1/2008 |
| Q: I recently dropped my microwave oven, the protective metal casing was displaced and the frame work ... A: In the glass opening of the door you see a screen with holes in it that allows you to see in. These ... | |
| Tube amp vs. solid state | 10/30/2008 |
| Q: People say things like "tube watts are louder". I have noticed that a 30W tube amp can sound the ... A: Feedback is a powerful tool for either tube or solid state. Solid state, especially a power ... | |
| Tube amp vs. solid state | 10/30/2008 |
| Q: People say things like "tube watts are louder". I have noticed that a 30W tube amp can sound the ... A: In objective measurements, on the bench with scientific measurement instruments, the power ratings ... | |
| Efficiency and induction motor | 10/29/2008 |
| Q: I am doing a project on improving induction motor efficiency at low loads. I need an idea how can I ... A: Well, there are only a few parameters that will give you a direct and objective, scientific ... | |
| Efficiency and induction motor | 10/29/2008 |
| Q: I am doing a project on improving induction motor efficiency at low loads. I need an idea how can I ... A: Well, sensing current changes is easy to do and a viable approach, but if you are restricted from ... | |
| insulation tester | 10/27/2008 |
| Q: what is the advantage of dc in megger instead of ac? why megger induced dc instead of ac ? A: DC is steady and constant voltage for easy and reliable test. AC is okey, too, but the frequency and ... | |
| how to investigate motor characterics? | 10/26/2008 |
| Q: I am just starting to play with micro-controllers and the interface electronics to the real world - ... A: Most computer/printer motors are designed around 5v power supplies. And, yes, if you over power ... | |
| phase locked loop | 10/11/2008 |
| Q: what do the transfer characteristics of a phase locked loop look like?? i.e. for IC 565, VCO ... A: First, take a look at this book: ... | |
| induction motor | 10/9/2008 |
| Q: how can one improve motor efficiency by reducing stator voltage when using slip as a load indicator? ... A: I need the motor model number or its specifications. There is not a generic answer to a situation ... | |
| Electrical Field and Applications | 10/7/2008 |
| Q: What is the importance/relevance to know the electric field distribution of a electrical apparatus? ... A: The electric field is very low in the cases you mentioned because they are conductive wires and the ... | |
| Live Line Installations | 10/6/2008 |
| Q: Want to know if there is any other procedure than the DPR(Double Pulley Rope)system to install OPGW ... A: Sorry, I don't know much about this matter. So, I don't want to mislead you in any way. I am going ... | |
| sensors | 10/4/2008 |
| Q: is there any way to detect the presence of a person in a room? A: Yes, many. Most common are motion detectors. They sense a moving body. A homely example is a ... | |
| physics | 10/3/2008 |
| Q: my question is about electric field intensity A: But there was no question. What is your interest? Here is some reading on the subject, if that ... | |
| Electric vs. Gas ovens | 10/2/2008 |
| Q: My wife is opening up a Bakery this upcoming spring. We are in the throws of deciding on equipment. ... A: You really need to have an electrician come in to examine the service requirements and give you an ... | |
| Magnets and Motion/Rotation | 10/2/2008 |
| Q: I have an invention that I’m putting on hold till I can figure out the physics of the concept will ... A: You lost me on the location of the magnets. However, I can say with confidence the magnets will ... | |
| AC electricity and TV cable | 10/1/2008 |
| Q: I am a property manager and I have had the same tenant in 4 years get a significant electric shock ... A: Yes, I agree with you. It is not normal nor is it correct. In the most rigorous approach you would ... | |
| insulation test | 10/1/2008 |
| Q: how can i test a domestic home 240 volt wiring installation for insulation continuity please A: Here is a tutorial on the basic idea of insulation testing. ... | |
| Blinking light patterns | 9/30/2008 |
| Q: I am basically trying to figure out what I need to get some lights to blink like an old movie ... A: Yes, I understand exactly the concept you have in mind. The actual implementation will be determined ... | |
| resistance/inertia of turbines in wind power | 9/30/2008 |
| Q: How great would one expect resistance to be for a wind powered generator with an output of 1.5 ... A: BTW: I did not mention before and maybe it does not relate to your query but the theoretical amount ... | |
| resistance/inertia of turbines in wind power | 9/29/2008 |
| Q: How great would one expect resistance to be for a wind powered generator with an output of 1.5 ... A: Not sure which resistance you are talking about. Can you clarify? Are you talking about the wind ... | |
| Efficiency and induction motor | 9/28/2008 |
| Q: I have been trying to improve motor efficiency by voltage reduction in stator of a motor. In fact i ... A: You did not explain how you are measuring torque, but let me assume you are using a dynamometer or a ... | |
| PCB Power | 9/28/2008 |
| Q: I'm sure that this is a basic EE question, but I am a programmer and don't know much about this. ... A: This is not a trivial design challenge. You must determine the current draw from all the leds and ... | |
| Efficiency and induction motor | 9/27/2008 |
| Q: I have been trying to improve motor efficiency by voltage reduction in stator of a motor. In fact i ... A: Surely you have some testing or measurements problem. If you keep the voltages constant to the ... | |
| PCB Power | 9/26/2008 |
| Q: I'm sure that this is a basic EE question, but I am a programmer and don't know much about this. ... A: You really should determine the circuit requirements first. If you need 5v or +,- 5v makes all the ... | |
| question about distribution transformers | 9/26/2008 |
| Q: My transformer of 750KVA having current rating 1000Ampere.currently transformer loaded as R-Phase ... A: If your measurements are correct, it is not overloaded. The 1kamp rating is for total current, most ... | |
| Efficiency and induction motor | 9/25/2008 |
| Q: I have been trying to improve motor efficiency by voltage reduction in stator of a motor. In fact i ... A: To get a trend line it would be wise to do a plot of efficiency vs the voltage (therefore current) ... | |
| Optical Communiations | 9/24/2008 |
| Q: 1) For Silica, compute the magnitude of the pulse spread per unit length if the source wave length ... A: What is this? A test? You really gave me a challenge! But, lo, sorry, I don't do homework ... | |
| Appliances from US to India | 9/23/2008 |
| Q: My friend is moving and wants to take appliances like Microwave, Rice Cooker, DVD Player, Digital ... A: See: http://www.india-travel-agents.com/india-guide/power-and-voltage.html You will find that ... | |
| earthing | 9/23/2008 |
| Q: How is earthing done in residential building? How are buildings protected against lighting strikes? ... A: Not sure how deep you want to go and what level of experience and quantitative knowledge you have. ... | |
| Op-amp | 9/22/2008 |
| Q: How is the op-amp circuit can be similar or better thatn the transistor emitter follower A: Op amp is more flexible and can be adjusted for various gain levels and feedback options, etc. It ... | |
| HOW TO MAKE LIGHT CHASER | 9/22/2008 |
| Q: I WANTED TO MAKE MY OWN LIGHT CHASER for FESTIVAL USE . THAT LIGHT CHASER SHOULD WORK WITH 100 FEET ... A: The closest to your specs that I can find is as follows: ... | |
| rated operating sequence of a MV circuit Breaker | 9/20/2008 |
| Q: please explain the following term used in the rated characteristics of a MV circuit breaker. Rated ... A: This is a duty operation and used for testing requirements for reliability and qualification of ... | |
| Wiring LED to guitar | 9/19/2008 |
| Q: Cheers Daniel- ANSWER: IS this what you are looking for? ... A: Yes, you can just eliminate the switches so the LEDs remain on all the time, whenever the power is ... | |
| Wiring LED to guitar | 9/19/2008 |
| Q: Cheers Daniel- A: IS this what you are looking for? http://www.youtube.com/watch?v=08aZZF3yF40 Here is a step by ... | |
| Inverter Over Load | 9/18/2008 |
| Q: I have an DC to AC inverted that I can't use because of the overload protection. Overload ... A: If you are powering it from an automobile system I really doubt you are getting 17v. Car type ... | |
| asking comment | 9/17/2008 |
| Q: can you answer me how to construct a wall digital watch with different melody alarm? what are the ... A: I would need to know more about what you want to accomplish and how much skill you have with digital ... | |
| Induction motor performance | 9/15/2008 |
| Q: I am calculating the induction motor performance i.e efficiency and power factor at different loads ... A: No, it is probably the characteristic of that motor or the test setup you have. The efficiency curve ... | |
| need urgent reply please | 9/14/2008 |
| Q: can u explain me what is meant by the C.T ratio written as 200/5/5A and 0-150/5A. regards. A: Please give me more detail. I don't know this matter. It looks like the voltage and current ... | |
| blinking theater lights | 9/13/2008 |
| Q: I work at a local museum and we are building an exhibit which simulates the look of an old 1950s ... A: Depending on the blink rate you want, there are many possible solutions. The first idea that comes ... | |
| electric water heater | 9/13/2008 |
| Q: I have a 220 volt water heating coil from an ordinary electric home water heater. I have hooked this ... A: Safety is the biggest issue. These heaters draw enough current that if the connections are not made ... | |
| Charging batteries | 9/12/2008 |
| Q: How much Power (horsepower) will an altenator require from a electric motor ( D&D Motors ES-31B ... A: Are these the 50 amp.hour batteries of the previous question? If a 50 amp.hour battery were ... | |
| How many amp hours do I have if: | 9/12/2008 |
| Q: If I connect 45, 2.3 volt, 50 amp hours batteries together to reach a voltage of 144 Volts, what is ... A: If they are fully charged and honestly give 50 amp.hours then the total output will be 45 X 50 = ... | |
| Induction motor performance | 9/11/2008 |
| Q: I am calculating the induction motor performance i.e efficiency and power factor at different loads ... A: But isn't it still turning a load? And isn't it still putting out mechanical power? So if the rpm ... | |
| Phase angle and Amplitudes | 9/11/2008 |
| Q: I have a circuit which is a voltage source connected to a 1.5K(Ohm) resistance, which is connected ... A: May we assume the capacitor is in series with the resistor? The current in the circuit is = v/z or ... | |
| Inverter Over Load | 9/10/2008 |
| Q: I have an DC to AC inverted that I can't use because of the overload protection. Overload ... A: It depends alot on the actual circuit design of the make/model inverter you are using. They don't ... | |
| transformer | 9/10/2008 |
| Q: 0 A: It will do just fine. What the rating says is that if you run the secondary with a load that ... | |
| Induction motor performance | 9/9/2008 |
| Q: I am calculating the induction motor performance i.e efficiency and power factor at different loads ... A: You can compute the input voltage and current angle to get the load to the supply voltage and the ... | |
| output current | 9/9/2008 |
| Q: we design a step up converter. i wonder how will i know that the circuit is supplying the required ... A: Here is the check you should make of your dc to dc converter: - Remove the load and measure the ... | |
| Induction motor performance | 9/8/2008 |
| Q: I am calculating the induction motor performance i.e efficiency and power factor at different loads ... A: Efficiency: Output power/input power. You can measure the input power with a true reading power ... | |
| output current | 9/8/2008 |
| Q: we design a step up converter. i wonder how will i know that the circuit is supplying the required ... A: The output current is a function of the load. Ohm's law. An up converter is designed to give a ... | |
| increasing output current | 9/5/2008 |
| Q: im just confused. I am designing a DC-DC converter. generally, what is the effect of having a higher ... A: Larger value of inductance increases its ac impedance and alters the RLC constants of the circuit at ... | |
| control board | 8/31/2008 |
| Q: I've got some problems designing a control board for an experimental control system.My board should ... A: TRANSFORMER: You are better off to purchase already designed stock. I don't know about your ... | |
| control board | 8/31/2008 |
| Q: I've got some problems designing a control board for an experimental control system.My board should ... A: Let me answer the power supply question. As a general rule you are best off using a power ... | |
| how to get started? | 8/27/2008 |
| Q: I want to learn how to do electrical, but where and how do I get started? I know this is a bold ... A: Not bold at all. It is a noble profession and easy to learn if you start at the beginning and learn ... | |
| increasing output current | 8/27/2008 |
| Q: what would be the fallback if we just connected a transistor at the output of a circuit to just to ... A: Yes, you can always add an extra amplifier state (unless noise or power from the supply or other ... | |
| Megger Tester | 8/25/2008 |
| Q: I want to purchase a megger tester to be used in measuring the insulation of motors and generators ... A: I cannot give you an ethical reply because there are local and international safety and testing ... | |
| thermostat resistance change | 8/25/2008 |
| Q: I am trying to build a little fan controller attached to a thermostat, while that thermostat is ... A: I understand the operation of thermostats very well. Where I am confused, still, is the sending a ... | |
| thermostat resistance change | 8/24/2008 |
| Q: I am trying to build a little fan controller attached to a thermostat, while that thermostat is ... A: I don't understand the question at all. A thermostat controller does not "output" resistance. It ... | |
| herz | 8/24/2008 |
| Q: can i use my tv 50herz to 60 herz power supply is 220 volt A: It depends entirely on the load you are going to connect to the power supply. Many loads, like ... | |
| Boost Converter for beacon | 8/21/2008 |
| Q: by the way, we've found out that the circuit we've made is supplying not enough current to the ... A: OK: So, you are using an IC chip and an up converter! Here is the one you should be using. ... | |
| Boost Converter for beacon | 8/21/2008 |
| Q: by the way, we've found out that the circuit we've made is supplying not enough current to the ... A: Yes, increasing the current is usually a function of the regulator and the current sensing circuit ... | |
| electrostatic screens | 8/19/2008 |
| Q: Whilst some circuits show the Electrostatic Screen taken to chassis most show it taken to signal ... A: There is a great variety of screens used for electrostatic shielding. Some are used for both ... | |
| 12v DC to 120v AC 60HZ 12 amps | 8/19/2008 |
| Q: I want to make my corded electric lawnmower into a cordless. I need to furnish 120v AC 60Hz ... A: Well, if the current lawnmower draws 120v @ 12 amps that is an input power of 120 times 12 = 1440 ... | |
| Addmisson In Greek Universty | 8/17/2008 |
| Q: I want to take Addmisson undergraguate elctrecal Enginering program for this i want to know ... A: May I refer you to these links. http://www.pr.ucy.ac.cy/EN/fund_raising/Omogenia_Leaflet.pdf ... | |
| Van De Graaf Generator | 8/16/2008 |
| Q: Hey, sorry if i have come to the wrong place to ask my question, but i have no idea who or where i ... A: I am quite certain this company will ship to you in Australia if you contact them directly. ... | |
| Boost Converter for beacon | 8/15/2008 |
| Q: Good day cleggsan! we are designing a boost converter circuit for a beacon with 12V(1.5A)/24V(0.7A). ... A: I do not understand the question. However, when you connect a supply to the load and it sags that ... | |
| Schwinn treadmill | 8/15/2008 |
| Q: Sorry i have had to ask a new question in order to continue our conversation. An interesting thing ... A: No, a hack cannot get into these products because the do not have an operating software system in ... | |
| Samsung DVD/VCR Player | 8/13/2008 |
| Q: I have a Samsung DVD/VCR combination. It is approximately five years old, but has been used very ... A: Probably the power supply failed. Either the fullwave bridge rectifier is bad of one of the ripple ... | |
| 50HZ to 60HZ | 8/12/2008 |
| Q: I am an Englishman living in the Philippines I cannot buy English style bread where I live. I would ... A: Yes, the bread maker motor will run, but at a higher speed which will create two problems for you: ... | |
| crank meggers for ground pest control. | 8/10/2008 |
| Q: Would this work for moles? It may sound like a silly question but I am being ruined by moles as well ... A: See: http://www.man-in-a-hurry.com/mole-eradication.html for an overview of ways to get rid of ... | |
| i need ur help | 8/8/2008 |
| Q: i need project topics in electronics and telecomminication. so pls forward me ur suggestion A: You must take some initiative on your own in selecting something of interest to you and within the ... | |
| keeping inductor current constant | 8/8/2008 |
| Q: i would like to know how can i keep the coil current constant at changing high frequencies.. thanks ... A: I don't understand the whole of your project. Generally, the properties of inductances and ... | |
| Electrical Motors | 8/7/2008 |
| Q: I want to drive electrically a shaft exactly two rotations. Which should be the most effective way ... A: Best and most simple, economic way is to turn it by hand. If you want to turn it electrically, you ... | |
| keeping inductor current constant | 8/6/2008 |
| Q: i would like to know how can i keep the coil current constant at changing high frequencies.. thanks ... A: To keep the ac current constant in an inductor you must increase the voltage as the frequency goes ... | |
| Schwinn treadmill | 8/5/2008 |
| Q: Sorry i have had to ask a new question in order to continue our conversation. An interesting thing ... A: I am still suspecting the aging capacitor. But, there is the possibility, now that you have ... | |
| Treadmill computer | 8/4/2008 |
| Q: we have a fold up treadmill at home and usually it works fine. On a couple of occasions (and today) ... A: In electronics we learn to never rule out anything. However, in my judgment it is less than 5% ... | |
| Treadmill computer | 8/4/2008 |
| Q: we have a fold up treadmill at home and usually it works fine. On a couple of occasions (and today) ... A: Sorry, I could not find the treadmill you spoke of. Can't find any treadmill products on the ... | |
| Active Noise Cancellation | 8/3/2008 |
| Q: I am doing a project in which i need to implement acoustic noise canceller which uses only a single ... A: I need to know more about the setup. Are you using headphones, speakers, or is it all electronic? ... | |
| Treadmill computer | 8/2/2008 |
| Q: we have a fold up treadmill at home and usually it works fine. On a couple of occasions (and today) ... A: It seems like a weak battery inside. Even if it is plugged in to the wall outlet, most of the ... | |
| DVD player sound disturbance | 8/1/2008 |
| Q: I have a music system, philips make. Some times its left channel makes disturbed sound where as ... A: It could be any of many things. Most likely it is the audio decoder/processor in the left channel. ... | |
| Dry contact controller | 8/1/2008 |
| Q: I recently purchased an airscape whole house fan.The unit came with a dry contact switch w/on off ... A: Yes, I don't know why it would not work. I did not pull a schematic diagram of the AirScape, but ... | |
| Dry contact controller | 7/31/2008 |
| Q: I recently purchased an airscape whole house fan.The unit came with a dry contact switch w/on off ... A: Solution (if it is running on regular household 120V line): Purchase a timer - with adequate ... | |
| over speed three phase induction motors | 7/30/2008 |
| Q: If you drive an induction motor faster than synchronous speeds it pushes energy back into the ... A: I understand the question. But I don't know the answer. The energy back vs input probably follows ... | |
| Genset | 7/28/2008 |
| Q: I have just purchased a 4000W/3500W genset. I am running 240V into a GenTran transfer switch to six ... A: I am not an expert in gensets. I am intrigued with them and admire the sophistication of them these ... | |
| signals | 7/26/2008 |
| Q: Some of my friends convert signals e.g. optical to radio etc. and i was just wondering if you ... A: Not sure I understand the question. If you are talking about audio signals from one digital format ... | |
| Sound problem | 7/26/2008 |
| Q: There is a sound problem in my computer. It has pentium D processor. It's right channel is not ... A: I still recommend you reinstall the driver software. Signal tracer is used as a simple method to ... | |
| lighting | 7/24/2008 |
| Q: What is the difference between a 12v recessed ceiling light and a 240v light? i know one requires a ... A: ONE: For the same lumen level there is little difference in power consumed. With 12v the current is ... | |
| Sound problem | 7/24/2008 |
| Q: There is a sound problem in my computer. It has pentium D processor. It's right channel is not ... A: The purpose in reversing the channel connections is to see if the bad channel switches over to the ... | |
| Sound problem | 7/23/2008 |
| Q: There is a sound problem in my computer. It has pentium D processor. It's right channel is not ... A: Both channels are okey when playing off cd drive? Only when you are inserting external stereo are ... | |
| ceiling fan | 7/23/2008 |
| Q: we are trying to wire a ceiling fan with a light kit. the light works but not the fan. We had a red ... A: Yes, fan and lights are usually on separate circuit so you can operate them independently of each ... | |
| kohler generator | 7/22/2008 |
| Q: I have a 2.5 kw kohler generator that is over charging the battery. Does anyone have any ideas what ... A: I have a few comments. As you can understand, from long distance it is difficult for me to be very ... | |
| transmission and distribution lines | 7/22/2008 |
| Q: I am trying to figure out how and what the differences are between overhead transmission lines and ... A: http://www.osha.gov/SLTC/etools/electric_power/illustrated_glossary/transmission_lines.html ... | |
| need idea about my final project | 7/21/2008 |
| Q: i was final year in my electrical degree. i need your assistant to know more about final project ... A: Please see my links in previous replies that I have give to others with similar requests. Among the ... | |
| computer power | 7/19/2008 |
| Q: Can a computer bought in USA be used in UK HP Touchsmart IQ775 in particular A: I don't know why not. I have traveled to London many times in the past and have had no trouble at ... | |
| elcb | 7/19/2008 |
| Q: there is sth strrange happeneing in my DB.the elcb trips sometimes every 20 minutes,sometimes after ... A: ONE: Possibly the circuit breaker is in need of replacement. The intermittent behaviour could be ... | |
| TV | 7/17/2008 |
| Q: My TV still does not power. I'll try to detail the symptoms. I'm trying to avoid replacing the ... A: Why are you afraid to replace the flyback? They are not so expensive and easy to replace. Most ... | |
| Semiconductor power supply for a 250 KW Shortwave Transmitter | 7/16/2008 |
| Q: We are working on a 250 KW shortwave transmitter working at 5 MHz, 7 MHz, 11 MHz and 17 MHz during ... A: Wow, what a system. Is it made by Harris? Has the manufacturer been contacted? I do not have a ... | |
| computing of load of household usage | 7/15/2008 |
| Q: how to compute how much wattage would consume a 135 watts, electric fan operating in 5 hours. 220 ... A: I think you already answered your own question. The consumption is 135 watts while it is running. ... | |
| convert 60Hz to 50Hz | 7/13/2008 |
| Q: I have a heat punp that is rated for 220V-240V/1 phase/50 Hz with a max of 6000W I was told that ... A: Here are a few ideas: ONE: (An expensive solution) http://www.hzfrequencyconverter.com/ TWO: ... | |
| Guitar amp transformer | 7/11/2008 |
| Q: I have a guitar amp I'm trying to convert from 220v to 120v (117) operation. I know the transformer ... A: You must have a power transformer that is mated to the original. If the voltages produced by the ... | |
| Blue prints | 7/10/2008 |
| Q: OK,relax I hope this isn't a dumb question. I've been an electrician for 20 yrs.Ive had 2 yrs. of ... A: Congratulations. You are making some good progress. I am not an expert in this area. But, I ... | |
| Guitar amp transformer | 7/10/2008 |
| Q: I have a guitar amp I'm trying to convert from 220v to 120v (117) operation. I know the transformer ... A: Is the amp now working perfectly at the 220v configuration? If so, I would not convert the ... | |
| Computer running off DC. | 7/9/2008 |
| Q: I am trying to get a computer to run off of DC power from batteries. now, from the wall it is 115v ... A: If the computer has dc in from the power pod you can run it directly from batteries into the pc (if ... | |
| BRUSHLESS GENERATOR & TEST JIGS | 7/8/2008 |
| Q: 1. What is Brushless generator 2. What is test jigs ? A) Test Jig with Diodes B) Test jig ... A: My experience is mostly in manufacturing arena and the jigs were designed by us production engineers ... | |
| BRUSHLESS GENERATOR & TEST JIGS | 7/8/2008 |
| Q: 1. What is Brushless generator 2. What is test jigs ? A) Test Jig with Diodes B) Test jig ... A: 1. Brushless generator or alternator is a special construction of two generating coils built onto ... | |
| 7473ic | 7/4/2008 |
| Q: why it used 7473ic to replace it to 555timer what happen? A: The LM555 is a timer IC; prewired to perform many types of timing applications. The 7473 is a dual ... | |
| direction change of ac syncronous motor with 02 wires | 7/4/2008 |
| Q: we are having one ac synchornous motor for our lubrication pump - it is operated by 100 v ac - 50 ... A: A synchronous motor is designed to run at a fixed rpm related to the ac line frequency. It runs at ... | |
| Transformer | 7/3/2008 |
| Q: What are the efeects if I use a 60 Hz power Transformer on 50 Hz System A: I have to know the end product. So far as the transformer itself the heat build up - all other ... | |
| Thyristor checks | 7/1/2008 |
| Q: What is a free firing thyristor? how do you check for one ? and if there is such a thing what sort ... A: Well, it is very possible a defective or marginal thyristor is unstable and due to some temperature ... | |
| Thyristor checks | 6/30/2008 |
| Q: What is a free firing thyristor? how do you check for one ? and if there is such a thing what sort ... A: To my knowledge there is no special category of a "free firing" thyristor or SCR. It is a generic ... | |
| Thyristor checks | 6/28/2008 |
| Q: What is a free firing thyristor? how do you check for one ? and if there is such a thing what sort ... A: A thyristor, or SCR (Silicon Controlled Rectifier), is a diode that has an input to control when the ... | |
| Astable Multivibrator | 6/27/2008 |
| Q: I have a cabin with avail. power. It is wired like a normal home w/200 amp service box. There is a ... A: The cost of 110v dc to ac inverter would be around the same cost as the lower voltage. You did not ... | |
| Astable Multivibrator | 6/26/2008 |
| Q: I have a cabin with avail. power. It is wired like a normal home w/200 amp service box. There is a ... A: Are you sure there is not already installed a dc to ac converter in the cabin and the outlets are ... | |
| Ringing Effect... Follow up | 6/25/2008 |
| Q: You wanted to know more about the situation and I could not access my university email to get the ... A: I am more confused than ever. I am going to have to have an overall schematic and block diagram of ... | |
| 1996 sony trinitron tv sound problem | 6/25/2008 |
| Q: my TV was blinking video in and out i researched it and took the cover off and turned the black knob ... A: Can you tell me what adjustment you made inside the set? Is there a marking or indication as to ... | |
| 'Ringing' Effect | 6/23/2008 |
| Q: I work at a mill working on a 3 phase system. Delta primary, Wye secondary on the transformer and on ... A: Is there an out-of-balance situation that requires the ground strap? If there is current in the ... | |
| Sizing cable for garage | 6/23/2008 |
| Q: I'm building a garage that is approximately 185 feet from our home circuit breaker box to where I ... A: You must know the wattage requirements more precisely, I think. For example, a 15 amp circuit (at ... | |
| mains testers | 6/22/2008 |
| Q: I have a mains tester screwdriver with neon indicator. In trying to trace a mains wiring fault I was ... A: Yes, to the above questions. I do not like or trust these little neon testers as they give false ... | |
| Amplifier Pioneer SA-6300 | 6/21/2008 |
| Q: I have acquired an old Pioneer SA-6300 amplifier which is faulty. There is a loud crackling noise in ... A: If the circuit is similar to most audio power amps there is a coupling (or decoupling) capacitor in ... | |
| tv power supply problem | 6/20/2008 |
| Q: i bougth samsung tv 29"plano and i send it to philippines but sudenly after 30 minutes was it turn ... A: Could you give me the model number? If this is a multi-voltage unit and you purchased it in the USA ... | |
| Need a project topic | 6/20/2008 |
| Q: I need a project topic on electronics and telecomminication. I`m in my final year, please i`ll need ... A: I have had several questions along this line the last couple of months. Go to this site: ... | |
| troucleshooting electrical control circuits | 6/19/2008 |
| Q: if switch A closes Light A illuminates If Switch B closes Light B illuminates If Switch C closed ... A: It is easy. Lights A and B are merely closed through a conventional SPST switch. Switch C is a ... | |
| high amps low voltage | 6/18/2008 |
| Q: I am conducting a test an 262 mcm and 535 mcm wire to be used in a windmill set up. Part of my test ... A: Use a table or tables such as are found at: http://www.interfacebus.com/Copper_Wire_AWG_SIze.html ... | |
| neuron network for timetabling | 6/17/2008 |
| Q: I've got a project for the neuron network for timetabling. I want to make a software to generate ... A: Sorry, I do not have much experience with MATLAB so I don't think I can be much help there. My ... | |
| Electrical Engineering proj (Renewable sources) | 6/13/2008 |
| Q: I'm Anand, a final year EEE student. I hav to Do a project this year. I'm Plannin to do somethin ... A: http://www.electronicsinfoline.com/Electronics_Projects.shtml The first one on the above site is a ... | |
| project topics for final year students on electronics and telecommunication | 5/14/2008 |
| Q: I am a final year student of electrical engineering at Ahmadu Bello University and humbly request ... A: There are so many areas to choose from. You must look into an area that is of interest to you and ... | |
| Impressed current cathodic protection (ICCP) | 5/12/2008 |
| Q: I want to know if the electrical power consumption of the ICCP is constant when it is working, or ... A: From your comments I just wanted to know what part of my answer you did not understand. I am also ... | |
| DC Generator with low rpm, high power output. | 5/8/2008 |
| Q: I am interested in doing a small experiment, where a DC Generator, rotates at 1-10 rpm, and ... A: It would depend upon the motor and its efficiency. But, the 1kg at 4cm is a force of 40 ... | |
| high amps under load | 5/7/2008 |
| Q: we have a pump that is drawing high amps under load(filling the banks) but when no load(recert to ... A: Oh, this is a systems problem. I think you should look into the control electronics. It is likely ... | |
| high amps under load | 5/7/2008 |
| Q: we have a pump that is drawing high amps under load(filling the banks) but when no load(recert to ... A: How do you know it is too high? What current did you measure? And when does it begin to go to ... | |
| Practical Application (Sawmill) | 5/6/2008 |
| Q: My name is Luke Robson, I recently completed 2nd year (of 4 years) of the engineering program at the ... A: I would need to know more about the wiring of the lines and their layout. But, to give you some ... | |
| DC Generator with low rpm, high power output. | 5/5/2008 |
| Q: I am interested in doing a small experiment, where a DC Generator, rotates at 1-10 rpm, and ... A: Power of 12v @ 5a is 60w. 60w = 0.08 hp From above it is very realizable and could be rather easily ... | |
| microprocessor | 5/1/2008 |
| Q: explain me lines given below in brief, "in 8086 micrroprocessor with only four segments ,we may feel ... A: Is this the book and page you read the statement? ... | |
| general | 4/30/2008 |
| Q: A: I have no idea. Perhaps you are referring to a slip ring; these are used in motors and generators to ... | |
| Star Delta Motor Theory | 4/29/2008 |
| Q: Could you tell me the theory behind the star and delta connections in a three phase ac motor with ... A: http://www.epanorama.net/wwwboard/messages/1786.html http://www.wiringmanual.com/SBIX-1.html ... | |
| Regarding transformer | 4/26/2008 |
| Q: Respected sir, I want expect clear explanation from you for myWe have conducted a testing in ... A: Sorry, I cannot give you a clear answer because the testing conditions are not clear to me, the ... | |
| inductive charging | 4/22/2008 |
| Q: I am an industrial designer at CCA. I am designing an electric pedometer that clips onto shoelaces ... A: Depends entirely upon two things: ONE - the type of materials the magnets are made of. (Some ... | |
| CT Ratio Selection | 4/21/2008 |
| Q: I have 11kV Panel Bus bar of 800A and was upgraded to 1600A and a CT of 1660/16 was used, so for the ... A: I don't know the standards on this type of setting. It involves knowing what the ANSI standard 242 ... | |
| variable DC Power Supply | 4/19/2008 |
| Q: I hope that you can tell me what I would need to build a 0 - 110 VDC power supply at 1A. A diagram ... A: Here is one with nice specifications: http://www.home.agilent.com/agilent/product.jspx?pn=6634B ... | |
| USA to UK Plugs | 4/17/2008 |
| Q: importing them to the Uk. I know the Voltage is different but can i cut of the USA plug and wire a ... A: Can you give me the model and the wattage rating? That would help. Generally, however, if sold in ... | |
| Mutual Induction | 4/17/2008 |
| Q: In any mutually inductive machine, does reversing the direction of current in one coil have the same ... A: Yes. If the position of the coil remains the same and its orientation remains in the same relative ... | |
| stator testing | 4/14/2008 |
| Q: I have a 16.5HP B&S engine in my lawn tractor, and it doesnt charge my battery. I wanted to check ... A: First, start the engine and let it run at the idle speed. Then, put the voltmeter on the battery ... | |
| Audio systems | 4/12/2008 |
| Q: I've been always on the lookout for good audio amplifier circuits for powering woofers. I did find ... A: Amplifiers with small power ratings such as used in pc speaker systems, etc. are usually just a ... | |
| Switching circuits | 4/11/2008 |
| Q: Sir, i am terrible in need of an advice. I am devising a circuit to drive an inductive ballast (230v ... A: Circuits such as this will require more bench checking to get the right parameters. If you scope ... | |
| Sony Model KP-41T25 | 4/11/2008 |
| Q: Cleggsan, Thank you for your previous answer to my shutdown problem on this rear projection ... A: Flybacks are very sensitive, when they start to go bad, to temperature, humidity and other things. ... | |
| Sony Model KP-41T25 | 4/10/2008 |
| Q: Cleggsan, Thank you for your previous answer to my shutdown problem on this rear projection ... A: I suspect you will end up having to replace the flyback transformer and the horizontal output ... | |
| Earthing | 4/9/2008 |
| Q: I know what is earthing but can you tell me the mechanism of what is happening? Is earth a conductor ... A: Earth grounding it really connecting to the neutrality of the earths zero reference potential. If a ... | |
| generators | 4/9/2008 |
| Q: I'm looking for mfg of direct drive no cog generators, must be aprox 70 rpm max at 2 kw 110 v ac ... A: Sorry, have no specific idea. Have you tried Thomas register and other such places? ... | |
| bicycle power and inverter | 4/8/2008 |
| Q: We are building a bicycle powered generator, using a DC motor as a generator. We can light up a 12V ... A: I suggested the car battery as a means to understand the current requirements during start up - ... | |
| bicycle power and inverter | 4/7/2008 |
| Q: We are building a bicycle powered generator, using a DC motor as a generator. We can light up a 12V ... A: Inverters take a big "kick" of power to start them into their multivibrator mode. If the inductor ... | |
| synchronous machine | 4/6/2008 |
| Q: how can the excitation voltage of synchronous generator be less than terminal voltage at leading ... A: Can you give me the make and model of the synchronous generator you are referring to? Then I can ... | |
| synchronous machine | 4/5/2008 |
| Q: how can the excitation voltage of synchronous generator be less than terminal voltage at leading ... A: Synchronous generators are run at a standard rpm so as to be able to keep an accurate frequency of ... | |
| switched capacitor integrator related | 4/2/2008 |
| Q: Why is it madatory that the gain of the opamp in a switched capacitor should be high.Why can't be ... A: I am not sure I understand your question, but let me take a guess at what you want to know. Please ... | |
| converting amps in 208 to amps in 480 | 4/1/2008 |
| Q: if i have a machine with a full load of 52 amps at 208 vac what would the load at 480 vac? A: In electrical systems where a transformer is used to change the distribution voltage the power ... | |
| training, value | 4/1/2008 |
| Q: 1)what kind of on-the-job training do you get? 2)what do you think your value to society is? A: No OJT. Learned it all on my own. I owe nothing to society. My value to society is what I do. I ... | |
| Earthing | 3/29/2008 |
| Q: Why we Choose earth?For high Voltage.I want to know about 33Kv,3Ph,50Hz ac supply earthed system ... A: By VCB do you mean a voltage controlled breaker? These are breakers that cut out when the voltage ... | |
| Switch rating | 3/28/2008 |
| Q: I have a requirement to switch 0.1A inductive load at 125VDC, the switch rating is 0.25hp motor ... A: Probably would be okey. But I would have to know more to give you a technical answer. The current ... | |
| Earthing | 3/28/2008 |
| Q: Why we Choose earth?For high Voltage.I want to know about 33Kv,3Ph,50Hz ac supply earthed system A: Not sure what the question is. Maybe I can guess what is on your mind. I will try. Earth is when ... | |
| Grounding | 3/26/2008 |
| Q: i have distribution trafo 250 kVA 460V/380V, delta-star connection. the neutral in secondary side is ... A: There should be no voltage between neutral and ground. The fact you measured 75v means it is out of ... | |
| capacitors | 3/26/2008 |
| Q: why a low value capacitor is connected in parallel with a high value capacitor in control circuits? A: There are many reasons. ONE: Could be to make it the correct overall value where tolerance is ... | |
| electrical engineering | 3/25/2008 |
| Q: im searching the internet for an answer to a electrical problem im trying to get to the bottom ... A: You are talking about wet-cell batteries. Right? Primary cells: Not reversible. They are ... | |
| Repairing Damaged Power Cord on Treadmill | 3/24/2008 |
| Q: The power cord on my treadmill has been severed. What is the safest way to reconnect the two ends? ... A: Yes, lots of juice, but it is still just the 110v ac. You can buy replacement cords that are UL ... | |
| Electrical | 3/23/2008 |
| Q: Is polarity refered as AC or Dc? Or both? A: Polarity is just an adjective to describe the voltage, charge or orientation of an object. Let me ... | |
| Sony TV No Picture No Sound Red Blinking Light | 3/22/2008 |
| Q: I have a Sony Trinitron KV-32FS100 (not sure probably 2005 year model)and it has worked great for ... A: The reset is done by unplugging the power cord for a couple of hours, then powering it back up. But ... | |
| Load Rejection Test | 3/19/2008 |
| Q: Currently PML Plant 2 is doing Load Rejection Test. Actually I do not really understand what is ... A: Adam, To be perfectly honest I am not an expert for your described system. I will try to give you ... | |
| load cell technology | 3/18/2008 |
| Q: I am working on a hobby project with a load cell application and am looking for advice. I need to ... A: I take it the device does not need to be extremely accurate. In this case I recommend the piezo ... | |
| load cell technology | 3/17/2008 |
| Q: I am working on a hobby project with a load cell application and am looking for advice. I need to ... A: There are so very many load cells, but maybe you are talking about the simplest of them all which is ... | |
| electrical engineering problem | 3/16/2008 |
| Q: im stuck with a problem sir and need some help,any help will be v-much appreciatd.i need help ... A: I do not understand the question. Are you short circuiting the battery with a copper jumper across ... | |
| solenoid | 3/14/2008 |
| Q: Sir, a solenoid has n turns then will its energy be proportional to in terms of n or how will it ... A: The pull force of a solenoid is a function of the number of turns and the current flowing through ... | |
| Sony Rear Projection Color TV Model KP-41T25 | 3/13/2008 |
| Q: Cleggsan, I am in the process of trying to fix a Sony Model KP-41T25 Rear Projection TV for a ... A: First, let me refer you to this tutorial site that may have lots of answers for you: ... | |
| E/F | 3/13/2008 |
| Q: what is earth fault? in earthed system and non earthed system A: A fault is a generalized condition when something fails relating the normal operation of an ... | |
| Know about earth pit | 3/12/2008 |
| Q: If I am diong Earth pit of 300x300mm GI plate and 450x450mm GI plate, how much KW load can i take in ... A: I do not know of any standard that universally applies. There are so many variables with soil, ... | |
| Dead Link | 3/11/2008 |
| Q: Your link provided in your 'How to read electrical schematic blueprints' is dead. Please update! ... A: Sorry, I don't recall your question. I don't keep a library of them. Could you please send the ... | |
| PT dammage | 3/10/2008 |
| Q: We have 33/11kv transformer and on 33kv side we have breaker and then the PT installed. the 33kv ... A: There are several possibilities that must be examined and diagnosed. ONE: Defective transformer - ... | |
| Capacitors | 3/8/2008 |
| Q: Electrolytic capacitors have polarity - they get damaged when used with wrong polarity. So how are ... A: Electrolytics used in AC circuits are usually of the non-polar type. Inside they consist of two ... | |
| pic light chaser | 2/26/2008 |
| Q: i'm trying to make a pic light chaser using pic16f84 with 16 LEDS. Can you tell me which pins to the ... A: There is an example of an 8 LED chaser at this site: http://www.ke4nyv.com/picprojects.htm and it ... | |
| a good resource | 2/26/2008 |
| Q: i want to ask if you know a good online library with electrical books, or any other places on ... A: If you have high speed internet connection you can find many books on google books. One example is ... | |
| what does Data aquesition mean | 2/25/2008 |
| Q: i want to know what does Data aquesition means?and in details what is Data aquesition in board and ... A: Simply put, data acquisition is when a processor, such a computer or data manipulator of some kind, ... | |
| a good resource | 2/24/2008 |
| Q: i want to ask if you know a good online library with electrical books, or any other places on ... A: BTW: Amir, there are several books that you can read parts of online if you go to google books and ... | |
| Delta Center Tapped Transformers | 2/21/2008 |
| Q: I have not been able (yet) to locate the theory to explain why a Delta Transformer has a 'high leg'. ... A: If the 3 phase line feeding the Delta (that is what you are measuring when you go across the lines) ... | |
| Delta Center Tapped Transformers | 2/21/2008 |
| Q: I have not been able (yet) to locate the theory to explain why a Delta Transformer has a 'high leg'. ... A: http://www.allaboutcircuits.com/vol_2/chpt_10/5.html Take a look at the above site which will give ... | |
| Line voltage in US | 2/20/2008 |
| Q: (I see that you're not claiming expertise in power & distribution, but this is pretty ... A: It used to be listed as 117v, 60 cps. But, now days the standard for the USA is generally given as ... | |
| Awareness Device | 2/19/2008 |
| Q: My name is Nichola Hall and I am in my final year at Northumbria University studying Product ... A: This is a job for a pc (or pocket pc). It would require some simple programming functions that a ... | |
| ac power adapter | 2/19/2008 |
| Q: I have a mini cam that runs on 2 AA bats. unfortunately there is not plug for a optional ac power ... A: 2 AA are 1.5 volts each. If they are in series connection it means the cam is running on 3v. You ... | |
| alternator connected to bus | 2/18/2008 |
| Q: suppose an alternator connected to an infinite bus of 220KV. the alernator terminal voltage is 21KV ... A: But something is rotating - even if it is electrical commutation. If it gets overloaded it will ... | |
| Ceiling fan | 2/18/2008 |
| Q: I have 6 Hunter model 25747-300 ceiling fans that I installed new several years ago and recently ... A: Owners manual and parts list can be found at: ... | |
| alternator connected to bus | 2/17/2008 |
| Q: suppose an alternator connected to an infinite bus of 220KV. the alernator terminal voltage is 21KV ... A: If the load is sufficient to slow down the rpm it will be kicked off the line by the automatic ... | |
| 18v battery charger | 2/17/2008 |
| Q: On a Dewalt battery charger there are 3 contacts. What is the function of the third contact ? A: There are two grounds; one is a circuit ground for the charger circuit. The other is a house ground ... | |
| 110 volt light bulb | 2/13/2008 |
| Q: Is there a way to make a 110 volt incandescent light bulb blink slowly ? Thank you, ... A: Yes, there are many, many ways. It is really a function of what you are trying to achieve and how ... | |
| microwave damage | 2/13/2008 |
| Q: We have an exposed spot on our microwave oven in which the metal is showing due to my son putting ... A: I do not have a clear image in my mind from your description as to what metal is showing. BUT: If ... | |
| Converting 50h to 60h | 2/12/2008 |
| Q: I use to live in Australia,now i live in Canada.I would like to bring all my power tools from ... A: You can also use a step-up transformer on the 120v to bring it up to 240 v as well. The change in ... | |
| Bandpass Filter | 2/11/2008 |
| Q: To Whom it may concern, I'm currently doing a research work about lightning propagation ... A: You are headed the right direction. I think you should check the engineering notes or design guide ... | |
| 6volt 4amp-hr battery disharge via 20watt tubelight | 1/30/2008 |
| Q: how many hours will a fully automatic emergency tubelight will work if it contains 6 volt ... A: 4 amp hours means it will run at 4 amps for 1 hour. And, 6v times 4 amps = 24 watts. So, simply ... | |
| Flybacks | 1/30/2008 |
| Q: I am constructing a plasma globe for which i need a flyback transformer. I think i need a fbt of ... A: Flyback transformers used in tv receivers are switched at approx. 15kHz and stay at high voltage ... | |
| Sine waves | 1/29/2008 |
| Q: How can i generate a sine wave of a desired frequency from a dc input? Is it possible to vary the ... A: There are many kinds of oscillators and waveform generators. ... | |
| Frequency | 1/29/2008 |
| Q: Do isolation transformers work with square wave inputs and spike inputs(output of a differentiator)? ... A: Depends on the bandpass of the transformer. Most transformers, especially iron core units, do not ... | |
| Resistor | 1/28/2008 |
| Q: I have a 230 - 800 v step up transformer. I dont know its kva rating. How can I use this to charge a ... A: If the output/secondary side of the transformer produces 800v rms, that means the peak value is ... | |
| power systems | 1/27/2008 |
| Q: How come 33KV overhead line with Lightning arrestors at the both ends of the each phases will trip ... A: I have no specific answer to this question, indeed, I suppose there is no "right" answer. Lightning ... | |
| Megger Tester Principle | 1/25/2008 |
| Q: Goodday Mr.Cleggsan, I just wondering how does the modern IR Tester @ Megger works.This tester is ... A: The rotating handle type has an actual generator inside which builds up a high voltage and applies ... | |
| Mosfet | 1/25/2008 |
| Q: hai. my question sound like this how and where can i get the information such as parameters and ... A: That's a pretty broad question and I don't know for sure what you want to research but here is a ... | |
| faraday cage | 1/24/2008 |
| Q: I am offshore sailing and was wondering how best to store my backup handheld gps and laptops from ... A: Good Question. Of course a direct hit by lightning is hard to recover from. But, as you suggest, ... | |
| megger value | 1/23/2008 |
| Q: what is the value of insulation resistance between line to line of 11kv cable. A: Sorry, don't know. It would be a wild guess for me. I suggest you google around for some answers. ... | |
| Cooling system | 1/21/2008 |
| Q: Hallo C, What does term "cooling system" mean in a high power system?How to determine the size of ... A: I have no idea what you are talking about; high power system can mean so many different things in ... | |
| Electrostatic generator | 1/20/2008 |
| Q: I am in need of help with electrostatic generators and some of its theory. Here is myWhat formulas ... A: The electric force field remains as long as the plate has a charge on it. A conductive covering or ... | |
| zappers | 1/20/2008 |
| Q: In a bug zapper circuit which uses series voltage multipliers, I observed a capacitor and a ... A: To keep the caps from charging too rapidly, building up the voltage too rapidly and causing it to ... | |
| zappers | 1/19/2008 |
| Q: In a bug zapper circuit which uses series voltage multipliers, I observed a capacitor and a ... A: The resistors are to provide a current path which slows down the charging cycle of the capacitor ... | |
| U.S. - UK compatability | 1/18/2008 |
| Q: My room mate has a exercise bike which he purchased in the U.S. and had shipped to Nigeria where we ... A: I would need the make and model of the bike to give you a precise reply, but as a general rule, the ... | |
| Design consideration for DLL | 1/17/2008 |
| Q: Sir, The answer is no way related to my question. my question is: Why should we assume this design ... A: I do not know the answer to your question. All pll and dll are designed with wide frequency ... | |
| Question about Delay locked loop Continue... | 1/16/2008 |
| Q: Actually it's not an IC.I'm designing a Delay locked loop based Frequency multiplier for IS-137 ... A: I forgot your question, but there is a ton of information on this topic if you google for it. Some ... | |
| PWM | 1/15/2008 |
| Q: Hallo C, What is pulse width modulation (PWM)? is it a kind of converter or converter controlling ... A: Pulse Width Modulation is a form of modulation. It is used in class D amplifiers, for example, as ... | |
| D.C. 6-12volt on/off switch & wireless remote activator | 1/15/2008 |
| Q: I have outdoor LED`s,20 in a string, and would like to be able to turn them on/off from inside the ... A: There are a number of remote controlled switches that will operate for this kind of application. ... | |
| unity gain frequency calculation both theoretical and practical for a technology | 1/14/2008 |
| Q: Can u tell me how to calculate the unity gain frequency of a technology (NMOS) both by practical and ... A: Sorry, I don't understand the question. If you are using an integrated circuit of some kind and ... | |
| Questiona about Delay locked loop | 1/14/2008 |
| Q: Why should we assume this design consideration i.e., the reference frequency is considered greater ... A: I need to know more; what IC set are you using and what application area are you referring to? In ... | |
| Volatge multipliers | 1/13/2008 |
| Q: How does the capacitance value effect a series voltage multiplier. I am using 50hz ac supply and ... A: If you follow the discussion found at: http://www.play-hookey.com/ac_theory/ps_v_multipliers.html ... | |
| Electrostatic generator | 1/13/2008 |
| Q: I am in need of help with electrostatic generators and some of its theory. Here is myWhat formulas ... A: Mostly it is theory; in practice it is done experimentally in the laboratory. But here goes: ... | |
| DC Series motor | 1/12/2008 |
| Q: What happens when a dc series motor is started on no load? If the motor does not have a constant ... A: This is over simplifying the matter of motor design. The relationship of windings, polar patterns ... | |
| Transformer | 1/12/2008 |
| Q: For an isolation transformer, if I use the primary neutral instead of the secondary neutral, will ... A: I don't understand the question. But, and isolation transformer by definition is considered a 1:1 ... | |
| Reversing the direction of rotation in an AC/DC motor | 1/10/2008 |
| Q: I have an AC/DC motor rated at 100W,220V,0.5A . This motor is specially designed to be used for ... A: why not turn the motor around and use the other end of the rotating shaft (if it has one)? The ... | |
| diagrams for Magnavox transformers | 1/9/2008 |
| Q: I am new to electronics. I am gathering parts to build a small tube amplifier. I have pulled four ... A: The numbers could be Maggies internal part number or just a reference number from the supplier or ... | |
| VA,VAR,W | 1/8/2008 |
| Q: Goodday 1.Why do we use kVA for equipment such as UPS and transformer but for other such as motor we ... A: Electrical current, voltage, impedance and power for ac systems is not a linear quantity and is ... | |
| ac motor | 1/8/2008 |
| Q: I,m looking for a small ac motor that is designed to drive to stall and hold there even in the ... A: Well, 1/4 HP is not usually considered small. You could be looking at a motor that weighs in at 30 ... | |
| Bi directional converter | 1/7/2008 |
| Q: Is there an inverter that also can act as rectifier or vice versa? Thanx regards, Ben ANSWER: ... A: I don't know what you mean by rectifier. A rectifier alone will not provide you any DC. You must ... | |
| Joe Flynn PPMT | 1/6/2008 |
| Q: Have you looked at this patented technology on magentic flux steering thats looks very interesting ... A: I don't know much about it but it is not a unique idea. The concept of combining permanent magnets ... | |
| Magnavox stereo with radio | 1/5/2008 |
| Q: I was hoping you might be able to help me date an old Magnavox stereo with radio. It is in a console ... A: It would be from the mid-1960s to early 1970s, but I don't have an exact date on it. Magnavox was a ... | |
| Bi directional converter | 1/4/2008 |
| Q: Is there an inverter that also can act as rectifier or vice versa? Thanx regards, Ben A: Don't know what you are asking. Inverter or converter circuits usually - but not always - have ... | |
| Help me!! | 1/2/2008 |
| Q: I would like to ask U something about generator What is generator inertia?? What about gas turbine? ... A: Inertia has to do with the mass of the object in motion and its speed or velocity. It is the ... | |
| QUESTION | 12/31/2007 |
| Q: In power electric, generator have a limit capacity of VAR. And what happen if VAR demand of the load ... A: If a load is greater than the rating of the generator the current flow becomes too great and causes ... | |
| High Voltage | 12/30/2007 |
| Q: Can a flyback transformer from my TV set be directly connected to the mains?Is there any special ... A: No. The flyback in a tv must be connected to the horizontal output circuit and run at the ... | |
| Capacitors | 12/29/2007 |
| Q: Can I charge a 1.1000v capacitor using 500v OR 2.500v capacitor using 1000v Which is feasible? A: You should never exceed the voltage rating on a cap. That rating is the manufacture telling you if ... | |
| Breakdown | 12/29/2007 |
| Q: When I short circuit(for a short time) the output of a voltage multiplier which is powered directly ... A: You are shorting the mains, but through the impedance of the series multiplier capacitor network. ... | |
| Transformer | 12/28/2007 |
| Q: I got a transformer with an output current more than the desired value? How can I reduce the current ... A: I must know the circuit, but if the resistance is in series with a standard load configuration it ... | |
| Transformer | 12/28/2007 |
| Q: I got a transformer with an output current more than the desired value? How can I reduce the current ... A: No, transformers are (mostly) voltage transformers and the current is a function of the loading ... | |
| Microwave oven possible damage | 12/27/2007 |
| Q: My building was hit by lightning and fried several electronic items. My microwave was sitting and ... A: I would not take a chance on it. It may be perfectly ok, but, if the metal were heated to a high ... | |
| High Voltage | 12/25/2007 |
| Q: I want to construct a step up transformer for an input of 230v 50 hz ac supply for which I want an ... A: Do you know how to wind a transformer? Do you have the metal laminated forms and paper isolators ... | |
| Capacitors | 12/24/2007 |
| Q: If capacitors allow ac ie transients(as used in filter circuits), does it mean that I cannot charge ... A: Sure. Caps are used all the time in ac circuits. They are the key ingredient in tuned circuits. LC ... | |
| battery chargers | 12/24/2007 |
| Q: I have a remote control truck. Will my 9.6 volt charger work for a 7.2 volt battery? This is a home ... A: You should never use a charger that was not specifically designed for the batteries being charged. ... | |
| What type of Motor is suitable for ceiling fan and why? | 12/23/2007 |
| Q: i am doing a research for the motor type for each electrical appliance which related electrical ... A: http://en.wikipedia.org/wiki/Ceiling_fan#Types_of_ceiling_fans From above, you will find there are ... | |
| Generation Parameters | 12/22/2007 |
| Q: Goodday, 1.I'm a bit confuse the relationship for Power,Voltage,Frequency and current, for example ... A: There is no or little current flowing until the connection is made to the grid. And once connected ... | |
| tech crosswards | 12/21/2007 |
| Q: hey!!! where can i find crosswards relating to electrical and electronics engineering.... A: I am assuming you mean crosswords for crossword puzzles. Is that so? Try: ... | |
| Generation Parameters | 12/19/2007 |
| Q: Goodday, 1.I'm a bit confuse the relationship for Power,Voltage,Frequency and current, for example ... A: Well, it is the same if two or more generators are connected to the grid. Each one must be up to ... | |
| Generation Parameters | 12/18/2007 |
| Q: Goodday, 1.I'm a bit confuse the relationship for Power,Voltage,Frequency and current, for example ... A: Speed of rotation is directly related to frequency output, of course, as you rightly understand. If ... | |
| Protocol | 12/17/2007 |
| Q: Goodday Mr Cleggsan, Could you explain regarding these protocols in a layman term so I can really ... A: You can google for these and find out any level of discussion about them. They are all specialized ... | |
| battery | 12/17/2007 |
| Q: tell me about vrla battery &smps&thyiroster ase charger A: There are so many battery charger systems and so many types of batteries (each requiring a different ... | |
| hi pot testing | 12/16/2007 |
| Q: how much time is required to take the results while doin hipot testing. A: I have no idea. But, based on my limited experience in this field, I would think 30 minutes may be ... | |
| Foot Spa Motor! | 12/16/2007 |
| Q: ..Awhile ago I purchased a Foot Spa (with Remote) from Sharper Image. I used the vibration, heat, ... A: Congratulations on your pending graduation. You can purchase a good enough vom at walmart or home ... | |
| Motor running at high amps | 11/25/2007 |
| Q: We have an HVAC system in which the evaporator fan motor is rated 3/4 HP, 1075 RPM, 116/60/1 and is ... A: If air flow is restricted it will put an extra load on the blower motor. You should try to keep the ... | |
| Motor running at high amps | 11/24/2007 |
| Q: We have an HVAC system in which the evaporator fan motor is rated 3/4 HP, 1075 RPM, 116/60/1 and is ... A: There are a few things you might want to check in answer to your question. ONE: Is there an high ... | |
| Can I reduce 5 volts to 4.5 volts | 11/23/2007 |
| Q: I have a Sony CD player and was wondering if I can use resistors to reduce the voltage from my 5 ... A: Better not do it. Why? Because the current requirement for a cd player is not constant. When it ... | |
| reactive power | 11/23/2007 |
| Q: C, Is this Article right? Electrical loads require apparent power to operate on alternating ... A: Only partially correct. But common to what is contained within non-quantitative textbooks. If ... | |
| Energy Storage System | 11/20/2007 |
| Q: C, It's me again. If you get a task to design a Power Electronics for storage system, what are you ... A: I see. You are in advanced phase of your own development system. I can help if you will send me ... | |
| Energy Storage System | 11/19/2007 |
| Q: C, It's me again. If you get a task to design a Power Electronics for storage system, what are you ... A: This is a pretty big investment. I suspect the cost of one of these systems is kilo bucks of a high ... | |
| Nominal Supply Voltage | 11/15/2007 |
| Q: Good afternoon, I read a specification of a storage system. There is written DC Bus Voltage 200 - ... A: Without the make and model I cannot be specific. However, normally it would mean the storage system ... | |
| 1HP generator low rpm | 11/14/2007 |
| Q: We are looking for a conventional 1HP generator that operates on LOW rpms -- in the 100 rpm range. ... A: http://www.solardyne.com/windgenerators.html Are these (above) the kind you are looking for? I ... | |
| Charger for N150 | 11/14/2007 |
| Q: Goodday Given a 150Ah battery, with each bank consist of 2x12V, meaning that each bank is 24Vdc,what ... A: The N150 is a compaq computer? Or what? The 150ah rating is for what? One 6v battery or two of ... | |
| Power Transformer | 11/9/2007 |
| Q: I wish to power up 8 110VAC single phase sockets from a 415VAC Transformer (415V 3 phase to 110VAC. ... A: Your question has no solution because the loading of each of the 8 sockets were not specified. It ... | |
| battery wire | 11/7/2007 |
| Q: So i have an mp3 player that the battery is dead, i open it up, the battery is connected with 2-wire ... A: The link has expired and it does not list the make/model. In any event, you still must invest in a ... | |
| battery wire | 11/7/2007 |
| Q: So i have an mp3 player that the battery is dead, i open it up, the battery is connected with 2-wire ... A: The battery must be an exact replacement or it could damage the player. But, if you wanted to use ... | |
| simple cicuit help | 11/6/2007 |
| Q: Ok I have a wild game camera, that will allow a 12V source to power it. It currently runs on four C ... A: How about this: Get rechargeable batteries. If you get two sets and the charger you can always have ... | |
| ELECTRICAL ENGINEERING QSN | 11/5/2007 |
| Q: You go for inspection at an industrial setup where you observe that the voltmeter is showing the ... A: According to my calculation the power being delivered is about 45kva well over the 30kva demand. ... | |
| Do I have enough power? | 11/5/2007 |
| Q: Basically I've been asked to supply sound equipment for a venue and I'd really like to understand ... A: Standard 120v ac outlets are good for about 8 amp draw safely before blowing a breaker. Some ... | |
| Electrical Motor | 11/4/2007 |
| Q: Goodday, Just wondering either can or can not for electrical motor that lost one of the phases run ... A: Yes, most of them will run; not at full load and not very efficiently, but under no load conditions ... | |
| Cell Phone EMF Hazards | 11/4/2007 |
| Q: I've been reading about EMF hazards concerning cell phones. Are there any EMF protection devices on ... A: All the reliable and respected investigations and studies indicate there is no hazard from cell ... | |
| capacitors | 11/3/2007 |
| Q: This question is about Motors that have capacitor start systems, such as A/C units. In Michigan ... A: Dan, I saw your comments. You are wrong and confused about capacitors. They can be charged with dc, ... | |
| electrical engineering | 11/3/2007 |
| Q: which type motor is used in whippers,fans. A: http://en.wikipedia.org/wiki/Ceiling_fan See the above for ceiling fans and similar applications. ... | |
| RTD Pt100 | 11/2/2007 |
| Q: Goodday Ragrding the temperature element RTD Pt100, let say we have 2 elements. How can we compare ... A: First check for continuity or short with ohmmeter. Second, check for resistance change as ... | |
| Electrical Supply System | 11/2/2007 |
| Q: Goodday Some questions regarding electrical supply system. 1.Why we have 1 and 3 phases system and ... A: Single phase is convenient for delivery of power to simple and common appliances and apparatus in ... | |
| Backup Parking Sensor | 10/31/2007 |
| Q: I recently purchased a backup sensor for my vehicle and installed it per the instructions. The unit ... A: You have the backup sensor connected to an ignition lead. When the vehicle is turned off the light ... | |
| Stereo | 10/29/2007 |
| Q: I have an old Pioneer Stereo Receiver (1000 watts). Worked great for 20 years. The fuse on back ... A: You can try a higher fuse, but it will likely blow too. The purpose of the fuse is to tell you that ... | |
| frequencies??? | 10/23/2007 |
| Q: Hey,I hope you can help me with thisConsider the list of successive frequencies 1, f1,f2,f3,10 Hz. ... A: Google for "linear graph paper" and at the top of the search page you will see examples of linear ... | |
| Earthing and System Grounding suitable for Telecomm Equipment | 10/23/2007 |
| Q: I want to know about earthing and system grounding scheme and earth pit drawing suitable for Telecom ... A: I can tell you it is important and must be done in accordance with safety rules and any government ... | |
| Rechargable batteries | 10/22/2007 |
| Q: I am trying to rebuild my dead laptop battery pack. I cracked open the battery case and pulled out 6 ... A: Yes, you are correct: Three cells in series will give the 10.8 volts. Then, another set of three ... | |
| Inordinate increase in electricity consumption | 10/20/2007 |
| Q: I live in South Africa where the electrical supply is 240volt/60cycles. Last month my electricity ... A: An IR or Infra Red tester merely looks for warm spots since warm temperatures put out higher and ... | |
| 12V Outdoor Lights | 10/18/2007 |
| Q: 1. If i want to connect 12V lights on 240V supply line, i would need a transformer to basically ... A: The junction box is for building and electrical code requirements. Check with your local supplier ... | |
| 12V Outdoor Lights | 10/17/2007 |
| Q: 1. If i want to connect 12V lights on 240V supply line, i would need a transformer to basically ... A: Yes, you need a transformer. It will transform the voltage down to 12 volts ac. If you are running ... | |
| Inordinate increase in electricity consumption | 10/16/2007 |
| Q: I live in South Africa where the electrical supply is 240volt/60cycles. Last month my electricity ... A: Didn't hear back from you. Did you find out what the power consumption cause was? Just curious. ... | |
| quarry in your kind consideration | 10/15/2007 |
| Q: sir, we have to supply philips make tube light vide model no TWG114/2005, SUPPLY 230V/50HZ, will ... A: Oh, I have no idea. Please look at the labels on the lighting fixture or tube - they always have the ... | |
| Correctly answering a question completes the circuit | 10/14/2007 |
| Q: When I was a child I saw a science fair project consisting of a series of questions and answers that ... A: Here are some projects that come close to what you are looking for. The electronic game board ... | |
| mcb | 10/13/2007 |
| Q: im looking for a wylex 5a BS 3871 mcb plug in,can i still get one? where from? thank you A: Don't know what country you are in, but they are all over the place in UK. Such as: ... | |
| running 220 single phase equipment with a 220 three phase source of power | 10/12/2007 |
| Q: I was considering buying a piece of equipment that runs on 220 single phase. I believe the 220 in my ... A: It is very rare for the home to be wired with 3-phase. However, the 220v line in homes now days is ... | |
| quarry in your kind consideration | 10/11/2007 |
| Q: sir, we have to supply philips make tube light vide model no TWG114/2005, SUPPLY 230V/50HZ, will ... A: Yes. The model you give is the fixture. You must obtain and install the proper florescent tube for ... | |
| Kurchoff's voltage law countinued | 10/10/2007 |
| Q: I read what you wrote about kurchoff's voltage law stating that the voltage drop in a closed circuit ... A: Voltage is "across" and current is "through". Series: The voltage drops across the elements add ... | |
| reducing ampage | 10/9/2007 |
| Q: how do i go about reducing a 12v 10A automotive power supply down to a 12v 1.8A supply? I'm sure ... A: Yes, it is so simple it will scare you! Solution: Put in a fuse at the output terminal. That is ... | |
| switch ratings question | 10/9/2007 |
| Q: I have a doubt regarding some ratings on a switch, does 125VT can be applied same as 3A 125VAC-L? ... A: The 125vt is okey; it means total voltage of 125. But there should be a current rating. If the ... | |
| Engineering terminology | 10/5/2007 |
| Q: I am doing my final year thesis, its about an AGV. the system basically works by having a PC ... A: Yes, you are correct. It means the basic supply to the board should be 24v, but the board will ... | |
| information | 10/3/2007 |
| Q: i am doing electrical engineering. mu question is that how we can define electromagnetic wave? and ... A: No one knows! We can measure the field strength, we can monitor its behaviour. We can tell where ... | |
| Generators: gosoline vs propane | 10/3/2007 |
| Q: I currently run a gasoline generator to charge my batteries and power my house which is off the ... A: Sorry, I have no personal experience nor have I been asked the question before. Here is some ... | |
| Combining output of DC generators | 10/1/2007 |
| Q: I would like to combine the output of several automotive alternators to produce something on the ... A: Control system is electronic monitoring of the output currents and/or voltages and feedback to the ... | |
| Combining output of DC generators | 9/30/2007 |
| Q: I would like to combine the output of several automotive alternators to produce something on the ... A: I am worried about using a 12v generator to get 38 volts! Have you tested them on a long term ... | |
| minimum distance from 138KV electrical transmission line | 9/30/2007 |
| Q: I what to know what is the minimum distance that a building can stand from a transmission 138KV ... A: I am not qualified to give you a straight forward answer to the question. Why? Because there are ... | |
| fla vs amp | 9/29/2007 |
| Q: If I know the fla of a device how can I convert to a amp rating. More to the point .. If I know fla ... A: No, if the voltage input is 220v and current consumption is 20a the power being drawn is: P = V X ... | |
| fla vs amp | 9/28/2007 |
| Q: If I know the fla of a device how can I convert to a amp rating. More to the point .. If I know fla ... A: Are you talking about "full load amps"? This term is usually used in reference to fault conditions ... | |
| thevenin theorem | 9/27/2007 |
| Q: what is the current passing through a 3ohm resistor if it is connected in parallel with two 6ohm ... A: What? It is not proper to put two batteries of different voltage ratings in parallel. Why? Because ... | |
| ultrasonic driller | 9/27/2007 |
| Q: please tell me were i can get a ultrasonic driller for drill holes in hard stones with the depth of ... A: http://www.advantage-drillbits.com/glass.html http://www.dadsrockshop.com/diamond_drills.html ... | |
| 12v lighting vs 220v lighting | 9/24/2007 |
| Q: I live in South Africa where the voltage is 220v.A lot of lighting is 12v (using a transformer), ... A: The usage of electric power is a function of the watt rating of the light bulb. If it is rated at, ... | |
| Bootstrapped Emitter follower | 9/23/2007 |
| Q: I was introduced to a bootstrapped emitter follower amplifier circuit for the first time and was ... A: R im my equation is the resistor going from emitter to ground. It is the current limiting element ... | |
| Bootstrapped Emitter follower | 9/23/2007 |
| Q: I was introduced to a bootstrapped emitter follower amplifier circuit for the first time and was ... A: http://www.uoguelph.ca/~antoon/tutorial/xtor/xtor3/xtor3.html Go to the above link and run down to ... | |
| UK appliances in the US | 9/19/2007 |
| Q: I've tried on many levels to get this answered; perhaps you can shed some light: I have 3 UK 240v ... A: In the US 240 must be wired by an electrician; it has different connectors and the runs are ... | |
| UK appliances in the US | 9/19/2007 |
| Q: I've tried on many levels to get this answered; perhaps you can shed some light: I have 3 UK 240v ... A: Read the second paragraph of this pdf doc: ... | |
| FM transmission 88-108 | 9/17/2007 |
| Q: we have a project where we want to inject a FM wideband signal directly into an FM radio receiver ... A: I know of no way without an individual center frequency for each spot on the band. However, there ... | |
| FM transmission 88-108 | 9/17/2007 |
| Q: we have a project where we want to inject a FM wideband signal directly into an FM radio receiver ... A: I must know more about the FM transmitter signal you are going to switch into the fm receiver. ... | |
| power supply | 9/14/2007 |
| Q: I need a power supply with an input of 240v single phase. A output of 1.8 to 2 volt 400 amps. It ... A: This is a very unusual design. It will be a boat anchor; that is, it will be pretty heavy to handle ... | |
| I get shocked when touching the washing machine | 9/13/2007 |
| Q: I have a "shocking" problem. We just bought our house and are upgrading the wiring in it. I ... A: Yes, you need proper grounding. There should NOT be any external metal, back or front, that is not ... | |
| volts vs watts | 9/8/2007 |
| Q: what is the difference in watts vs volts. In laymens terms please. also what are the typical ... A: Residential power service (in the USA) is 220/110 volts AC at 60 Hz. The typical house is wired for ... | |
| volts vs watts | 9/8/2007 |
| Q: what is the difference in watts vs volts. In laymens terms please. also what are the typical ... A: Voltage is the unit of measure of how much potential or electromotive force is present. It is ... | |
| Electrical and Electronics | 9/7/2007 |
| Q: In a permanent magnet generators why is it required to use reactive power capacitors, at the output ... A: Calculate the inductive reactance of the inductance. (Xl = 2pifL). Capacitance must equal same ... | |
| Electrical and Electronics | 9/6/2007 |
| Q: In a permanent magnet generators why is it required to use reactive power capacitors, at the output ... A: I think the main purpose of the cap is for correction of the power factor. This keeps the current ... | |
| ELECTRICAL | 9/5/2007 |
| Q: wHAT IS THE BENEFIT OF FIXING AN MCB in house. What is the difference between MCB & RCCB A: http://www.hagerbr.com.au/menu/services/frequently-asked-questions/800-84.htm I do not know much ... | |
| shunt generators | 9/1/2007 |
| Q: in a shunt generator, why does current decrease through the shunt field as resistance is added to ... A: The parallel resistance is causing a greater loading on the generator due to the increased current ... | |
| shunt generators | 9/1/2007 |
| Q: in a shunt generator, why does current decrease through the shunt field as resistance is added to ... A: Where are you adding resistance? And what do you mean by adding resistance? If you are adding the ... | |
| transformer | 8/31/2007 |
| Q: In case of delta/delta transformer if one phase of primary is blown out what will be its effect on ... A: It will depend on so many factors. In my opinion, the following generalizations may be observed: ... | |
| impedance | 8/31/2007 |
| Q: what is the significance of per unit impedance? A: I don't understand your question. Impedance, by definition, is its quality of impeding current flow ... | |
| DC generator | 8/27/2007 |
| Q: What is happen if stator and rotor of DC generator rotate in opposite direction? Because I want the ... A: The stator - which means stationary - is usually thought of as remaining in a fixed position while ... | |
| DC generator | 8/27/2007 |
| Q: What is happen if stator and rotor of DC generator rotate in opposite direction? Because I want the ... A: Everything else remaining the same, the output voltage of the generator will be reverse polarity; + ... | |
| 230 volt wye systems | 8/24/2007 |
| Q: wild leg seems to cause problems with control systems can this be eliminated ANSWER: Can you give ... A: Something is way wrong. Leg voltages must be nearly same. If not, the transformer may be way under ... | |
| 230 volt wye systems | 8/24/2007 |
| Q: wild leg seems to cause problems with control systems can this be eliminated A: Can you give me more information about the system? What kind of service is it? Loading and ... | |
| 60Hz Device on a 50 Hz supply | 8/23/2007 |
| Q: I just bought a subwoofer from US that runs on 111V 60 Hz. I live in india where the supply is 220V ... A: I wish you had given me the make and model number. That way I can be more specific in my answer. ... | |
| 9v connection to a Tripple a battery connection | 8/20/2007 |
| Q: ok i don't know if i asked the correct question. I have a tiny tiny camera that i will install on ... A: Well, 9v is 9v. So long as you have the right voltage and current capacity to run the camera you ... | |
| basic spectroscopy system | 8/20/2007 |
| Q: In spectroscopy system,why does a square wave input will not produce an accurate estimate of the ... A: Linearity is important in any communications channel because a non-linear function causes either ... | |
| making a simple AC to DC rectifier | 8/17/2007 |
| Q: Hope you had a nice day! your column simply rocks. Can you please give me the details on how to make ... A: Basic approach is a transformer and two full wave rectifier bridges. The transformer has two ... | |
| Reducing DC voltage safely | 8/16/2007 |
| Q: I would like to modify a rechargeable work light that uses 19.2 volt lamps to use something more ... A: In any event, many of the LED lamps and bulbs will take a wide range of voltage input. Many of the ... | |
| Reducing DC voltage safely | 8/15/2007 |
| Q: I would like to modify a rechargeable work light that uses 19.2 volt lamps to use something more ... A: So the batteries are in series? Strange arrangements I must say. However, I would urge you to look ... | |
| Reducing DC voltage safely | 8/15/2007 |
| Q: I would like to modify a rechargeable work light that uses 19.2 volt lamps to use something more ... A: A dropping resistor is safe only with resistive filament type lamps (incandescent). Other lamps ... | |
| Magents and Electricity | 8/14/2007 |
| Q: I am trying to calculate how much voltage/current can be generated by spinning magnets in the ... A: http://www.abdn.ac.uk/physics/s6/labeandm.pdf The above is not what you are looking for, but it ... | |
| ECM motor feasability for constant volume fan coil | 8/14/2007 |
| Q: What are the advantages/disadvantages in using an ECM motor on a constant flow (cfm) fan coil unit? ... A: Look at this page: http://www.nailor.com/pdf/ECM_1.pdf And, ... | |
| basic spectroscopy system | 8/13/2007 |
| Q: In spectroscopy system,why does a square wave input will not produce an accurate estimate of the ... A: Not knowing the details of your system leaves me guessing to some extent. But, here are my thoughts ... | |
| harmonic | 8/5/2007 |
| Q: explain about harmonic in power system A: Harmonics are present whenever the waveform is other than a pure, undistorted sine wave. Anything ... | |
| Battery Charging | 8/4/2007 |
| Q: Goodday... Long time no see.. Just want to ask there are 2 methods of charging bettery either by ... A: Well, they are really nearly the same concept. Look at it this way: Constant Voltage is when the ... | |
| request | 7/31/2007 |
| Q: Sir, I have read about standing wave ratio, but I could not understand about the portion of ... A: Please see the below for a theoretical discussion: http://en.wikipedia.org/wiki/Standing_wave_ratio ... | |
| comparator and the constant current source | 7/27/2007 |
| Q: first of all, i wanna thanks to you if you want to answer my question. i'm in the third year in ... A: See this page: http://ourworld.compuserve.com/homepages/Bill_Bowden/page12.htm It has complete ... | |
| wind energy generator | 7/24/2007 |
| Q: Sir, I shall be much obliged if you could kindly clarify the following: 1) What is honey comb ... A: A honeycomb winding has the wires layed down at an angle; they are machine wound. Having motor and ... | |
| Converting Fan current into current for a Projector | 7/23/2007 |
| Q: I have this project where i'm turing one of my rooms into a gameroom/theatre and will be installing ... A: Yes, in most cases. Go to the breaker at the main panel in the house and check the current rating ... | |
| hi | 7/20/2007 |
| Q: some con artist electrcian rigged my friends apt in such a way that coned wont know that thier ... A: Sorry, it is not possible to answer your question without knowing what has done to the home ... | |
| odd power conversion problem | 7/20/2007 |
| Q: I have sort of an oddball question. I am assisting with the build of a art-car. A big part of that ... A: So, you need 16a x 4 hrs = 64 amp.hrs of energy roughly. Yes, it is true that automotive batteries ... | |
| odd power conversion problem | 7/19/2007 |
| Q: I have sort of an oddball question. I am assisting with the build of a art-car. A big part of that ... A: good luck with your project. sounds interesting. You are right; 6v converters are not common. If ... | |
| request | 7/19/2007 |
| Q: Sir, please teach me with explain, 1)Dry bulb temperature is equeal to wet bulb temperature ... A: This sounds like school work. We don't do school work, but we like to teach you how to work it out ... | |
| comparator and the constant current source | 7/18/2007 |
| Q: first of all, i wanna thanks to you if you want to answer my question. i'm in the third year in ... A: Comparator with hysteresis merely means that as the comparator has an input with voltage going up ... | |
| Battery Charger as a battery pack? | 7/18/2007 |
| Q: I have a battery powered set of speakers that I want to use for an iPod. I also have a 4xAA charger ... A: First, you must look at the battery compartment and you will see the connections to the batteries is ... | |
| Mark 5 | 7/17/2007 |
| Q: I am an electrical tech by profession and was recently asked by a prospective employer if I have an ... A: Terribly sorry, I am not familiar with the Mark 5 control system. For a good, basic overview of ... | |
| Seismic Amplifier | 7/15/2007 |
| Q: Having a problem with seismic amplifier (2-741's) modeled after Joe Gerencher of Moravian College ... A: Schematic diagram is not at the url you gave. But, based on your comments, it seems you may be ... | |
| 1970's MXR 10 Band EQ Pedal | 7/15/2007 |
| Q: I am a musician and have an old 1970's vintage MXR 10 band Equalizer which I just paid $50 for. ... A: Go to Radio Shack or any electronics parts store and tell them you want a .0068 Microfarad and a .15 ... | |
| 1970's MXR 10 Band EQ Pedal | 7/15/2007 |
| Q: I am a musician and have an old 1970's vintage MXR 10 band Equalizer which I just paid $50 for. ... A: No, no. I am suggesting you just go to the local Radio Shack store an put in a garden variety cap. ... | |
| 1970's MXR 10 Band EQ Pedal | 7/14/2007 |
| Q: I am a musician and have an old 1970's vintage MXR 10 band Equalizer which I just paid $50 for. ... A: Jim Dunlop bought out the entire business of MXR Innovations when they went broke. Whether his ... | |
| 1970's MXR 10 Band EQ Pedal | 7/14/2007 |
| Q: I am a musician and have an old 1970's vintage MXR 10 band Equalizer which I just paid $50 for. ... A: Got the photos just fine. You did not identify the part, but if you are referring to the ... | |
| 1970's MXR 10 Band EQ Pedal | 7/14/2007 |
| Q: I am a musician and have an old 1970's vintage MXR 10 band Equalizer which I just paid $50 for. ... A: Is this the one? http://www.pulseonline.com/mxr10.htm Maybe just buy a new one. I don't know the ... | |
| request | 7/13/2007 |
| Q: Sir, 1)What is a megger? Earth tester sends (ac/dc) through earth and (ac/dc) through metre. ... A: 1) Megger is device to measure leakage current under high voltage conditions. See: ... | |
| request | 7/12/2007 |
| Q: I need to know how a sound is measured(principle), and what is the unit of sound A: Sound pressure level is measured in db or decibels. Named after Alexander Graham Bell the early ... | |
| request | 7/11/2007 |
| Q: Sir, I have found your id from www.allexperts.com. I am a electronics diploma holder, I need some ... A: Communications is a wonderful field. It requires, at the engineering level, a deep understanding of ... | |
| LEDs configuration | 7/10/2007 |
| Q: i have a project whereby i need to illuminate 70 LEDs on a display base underneath a model car. i ... A: It is very simple; take the LED you are going to use, find out the current rating for one LED and ... | |
| a dark switch | 7/10/2007 |
| Q: I am trying to make a security circuit that will set the alarm off when the LDr picks up no light. ... A: The most simple way is a relay. When the light comes on it flips the relay; indicators go off or on ... | |
| telecommunication | 7/10/2007 |
| Q: sir what is the bandwidth of FM. A: Anlog fm is 200kHz spacing; mask is 150kHz. Audio response is limited to around 18khz practically ... | |
| a dark switch | 7/9/2007 |
| Q: I am trying to make a security circuit that will set the alarm off when the LDr picks up no light. ... A: I am not understanding the purpose of the timer. I am clear you want a dark switch; that is, when ... | |
| terapia electrica para tendones en equinos | 7/9/2007 |
| Q: hola. mi pregunta es como puedo producir de 1 a 5 mA de intensidad, en un tiempo de 1 a 5 ... A: Subject: electrica therapy for sinews in equinoshello. my question is like I can produce from 1 to 5 ... | |
| Samsung HDTV projection | 7/7/2007 |
| Q: I was gone for one of my long trips on a semi-truck. My parents love watching deal or no deal, and ... A: I suspect the tv has gone into protection mode. This circuit is a sort of intelligent electronic ... | |
| Thristor and SCR Gate Signal | 7/6/2007 |
| Q: Goodday, When I look at rectifier circuit, there is SCR and Thyristor in the diagram where the ... A: Depends on the circuit requirements and what is to be accomplished. In a sophisticated system the ... | |
| electrical | 7/4/2007 |
| Q: why transformers are rated in KVA? what is the power factor of a transformer? ANSWER: Transformer ... A: Depends entirely on the size and design of the transformer. You should contact with the ... | |
| electrical | 7/3/2007 |
| Q: why transformers are rated in KVA? what is the power factor of a transformer? A: Transformer are rated in KVA because a load on the secondary side may be very reactive with a power ... | |
| Potential Transformer | 7/2/2007 |
| Q: there are two P.T.'s i am using for a protection and measuring system on 6.6kv. P.T.'s are of 50 VA ... A: My first reaction is the fuse is not big enough. But, I don't understand the configuration. Can you ... | |
| How power factor vaires with load (motor/transformer) | 7/1/2007 |
| Q: Following a discussion with another expert about power factors, they are unavailable to take a ... A: Yes, it is true. Why? Because it ceases becoming a inductive coil and starts becoming a ... | |
| Electric Generator | 7/1/2007 |
| Q: Would you happened to know how we can find a manual for( Style )# 563395-D & Serial# 1522377 From ... A: My guess is the only way would be: 1. From the Westinghouse archives. You must reach them by ... | |
| reducing voltage. | 6/29/2007 |
| Q: I am trying to reduce a linear 0-5v reference circuit on a modified automotive application. The ... A: Pretty hard to give you a best idea with such a limited picture of what you are wanting to do. The ... | |
| How power factor vaires with load (motor/transformer) | 6/29/2007 |
| Q: Following a discussion with another expert about power factors, they are unavailable to take a ... A: Yes, of course. I know everything. Well, almost everything. The power factor is a function of the ... | |
| compouter power supply question | 6/29/2007 |
| Q: I hope I don't bore you to death with this question!! I have a comptuer that is using a micro ATX ... A: I don't understand why you would be unwilling to use a 250w supply. YOu would have more than enough ... | |
| CIRCIT BREAKER | 6/27/2007 |
| Q: I HAVE A CIRCUIT BREAKER THAT HAS 2 30 AMP CIRCUITS WITH 2 HOT WIRES. I WANT TO INSTALL A 50 AMP ... A: I am an electrical engineer, not an electrician. You should ask an allexpert from the electrician ... | |
| LPS Capacitance,resistance and inductance | 6/25/2007 |
| Q: goodday Im quite confuse with ligtning and earthing system.Do we want low Xc and XL or higher ... A: It is a matter of understanding Ohms Law as it relates to voltage, current and impedance. Then, it ... | |
| LPS Capacitance,resistance and inductance | 6/25/2007 |
| Q: goodday Im quite confuse with ligtning and earthing system.Do we want low Xc and XL or higher ... A: Yes, impedance is the vectoral sum of resistance and reactance in a circuit. The higher the ... | |
| Course on Pneumatic Control Valve | 6/22/2007 |
| Q: I am Instrumentation Engineer from INDIA. I wanna know about any course offered by any university in ... A: That is a broad field and I think you will have to narrow it down to the application area that you ... | |
| about rf modulator | 6/22/2007 |
| Q: ,, i want to connect more than one device(camera has an a/v ) to the same tv through rf modulator, ... A: Radio Shack has an interesting RF Modulator, Model: 15-1988, which has several inputs and two ... | |
| Microprocessor-8088 | 6/19/2007 |
| Q: I'm student of Bio-medical Engineering in Iran, one of our course is Microprocessor and we learn ... A: This is a very famous but very old micrprocessor. It was the main cpu for many of the early ... | |
| "Fluorescent regular tube light" and its effect on humans | 6/17/2007 |
| Q: 1.is that produce ultravoilet-C rays outside the glass of flourescent tube or all of the rays is ... A: I am no expert on this subject without some research. In fact, there are still studies going on that ... | |
| Tape Head Connection | 6/13/2007 |
| Q: My old tape recorder's erase head needed replacing (the head has two wires connecting to it) and I ... A: Your analysis would be correct if the bias oscillator was symmetric, but what if it is dc shifted ... | |
| Converting a 50Hz appliance to 60 Hz? | 6/13/2007 |
| Q: I just purchased a UK model oven. It is a 220V 50Hz model. I want to convert it to US 220V 60Hz. ... A: The model you mention does have a fan motor and the clock mechanisms that need 50 hz power. If you ... | |
| Converting a 50Hz appliance to 60 Hz? | 6/12/2007 |
| Q: I just purchased a UK model oven. It is a 220V 50Hz model. I want to convert it to US 220V 60Hz. ... A: It is not the clock that you should be concerned with but safety and fire. If it is a microwave ... | |
| Adapter voltage question | 6/12/2007 |
| Q: I'm looking for some advice about power adapters. I have an old sequencer that I acquired without ... A: I can assure you the 12v, 1amp pod will do the job. If you were worried about it you could put a ... | |
| Adapter voltage question | 6/12/2007 |
| Q: I'm looking for some advice about power adapters. I have an old sequencer that I acquired without ... A: The sequencer will draw the amount of current that it needs. The requirement is that the power ... | |
| Tape Head Connection | 6/10/2007 |
| Q: My old tape recorder's erase head needed replacing (the head has two wires connecting to it) and I ... A: 120 microseconds is the equalization required for this formulation. It has nothing to do with the ... | |
| Tape Head Connection | 6/10/2007 |
| Q: My old tape recorder's erase head needed replacing (the head has two wires connecting to it) and I ... A: Some heads have built in diodes to keep current going only one direction in order to keep the high ... | |
| can you help or advise China to UK | 6/5/2007 |
| Q: I live in UK where domestic power is supplied at 50Hz 240V (though in fact usually 230V) and single ... A: Here is a link to power system frequency and voltage for all countries of the world: ... | |
| tv electrical | 6/4/2007 |
| Q: i purchased a second hand zenith tv, i don't know how old it is. when i plug it in my surge ... A: Yes, this means the surge protector failed. I think you should not use it as the rating is too low ... | |
| tv electrical | 6/4/2007 |
| Q: i purchased a second hand zenith tv, i don't know how old it is. when i plug it in my surge ... A: What do you mean when you say "move the strip"? And moving the strip cuts off the tv - does that ... | |
| Bulding a Generator | 5/30/2007 |
| Q: I have a Generator head laying in my house and i wanted to know how to hook it up. I need a mount to ... A: Not sure I understand the question. Do you need the coupling mechanism to attach the drive motor to ... | |
| Florescent fixture wiring situation | 5/29/2007 |
| Q: ..I decided to replace the 2 florescent shop light fixtures in my basement. Each fixture is ... A: You will have to replace the ballasts, probably. I do NOT recommend you try to convert the shop ... | |
| Battery Selection | 5/28/2007 |
| Q: Goodday..Some questions regarding batteries. 1. Whats the difference between normal/lorry batteries ... A: Sorry, Malaysia..... Only short distance away! No, they are essentially the same battery - but ... | |
| Battery Selection | 5/28/2007 |
| Q: Goodday..Some questions regarding batteries. 1. Whats the difference between normal/lorry batteries ... A: Well, I don't know what you mean by "normal" battery because there are so many types. 1. Lorry or ... | |
| induction I think | 5/28/2007 |
| Q: I would like to figure out how much copper wire and how much of a magnet I need to produce a given ... A: The following URL has several pages on the basic principles of induction, the equations governing ... | |
| Adapter vs Charger | 5/26/2007 |
| Q: First of all I hope you have a good day. I've lost my Ni-Cd battery charger, could I use AC-DC power ... A: Better not. Why? Because Ni-Cads - as well as most any battery - requires a charger that charges at ... | |
| Wafer Type Light Bulb Blinker | 5/25/2007 |
| Q: Years back I had a small wafer type blinker that could be placed into a lamp socket to make the ... A: Yes, I know exactly what you are asking about. I scanned many suppliers to see if they are still ... | |
| Electromagnet Design | 5/25/2007 |
| Q: I'm wanting to build a round electromagnet that is 3" in total diameter (coil included). I want to ... A: Here is one design approach for producing strong field strenght in an open gap of a laminated iron ... | |
| Recharging Battery | 5/24/2007 |
| Q: First of all I hope you have a good day. I've a cordless phone, I've lost the handset charger. Would ... A: I am having a good day; excellent day. Wow! You are still using a Nickel-Cadmium battery! I did ... | |
| Sine wave invertor | 5/23/2007 |
| Q: Output voltage of any sine wave invertor shall be pure sine wave like ac generator or it will be ... A: Your question is very context related. Please tell me what kind of sine wave inverter you are ... | |
| Sine wave Invertor | 5/20/2007 |
| Q: How sine wave invertor affects inductive, resistive and capacitive load? for which application ... A: Sine wave inverter is merely 180 degree shift of the sine wave. When comparing the input with the ... | |
| Convert 230V appliance to 120V | 5/19/2007 |
| Q: We are manufacturing electrical pumps of low wattage (about 10W to 50W) for 230V application. In ... A: Are these pumps driven by electric rotary motor with 230v input requirement? Have you thought of ... | |
| battery | 5/17/2007 |
| Q: why there is more nagative plat then positive in leadacid battery. A: The electro-chemistry of the materials used require greater surface area on the negative plates. ... | |
| AC Peak detector application? Or missing portion detector? | 5/17/2007 |
| Q: I would like to know what kind of circuit to use to detect when an AC limiter is working. For ... A: Yes, there are signal comparator circuits galore. Here is one already packaged that will do the job ... | |
| Zero/Negative/Positive Sequence | 5/16/2007 |
| Q: Goodday.. Could you explain on these terminology. What do they mean? When we design or calculate ... A: I think it has to do with inrush current testing. The question is what happens when we first throw ... | |
| High Leg Delta | 5/15/2007 |
| Q: I just started a job at an old mill building and the electrial comming into the building is 120/240 ... A: 120 is almost always solid because it comes from either side of the 240 and the center tap on the ... | |
| DC circuit adding | 5/15/2007 |
| Q: I'm doing a paper on harnessing human power used while pedaling a stationary bike. I know that the ... A: Yes, two generator electrical output can be combined and the total power is the sum of them. ... | |
| DC circuit adding | 5/15/2007 |
| Q: I'm doing a paper on harnessing human power used while pedaling a stationary bike. I know that the ... A: Power is: P=VxI In your example of 12v and 10a, the power would be 120 watts. That is like two, ... | |
| Solo run motor vertical and horizontal | 5/14/2007 |
| Q: Goodday.. Is there any different in amps when we do solo run for motor at horizontal and vertical ... A: Oh, that makes all the difference in the world. A vertical design has totally different bearing ... | |
| Solo run motor vertical and horizontal | 5/14/2007 |
| Q: Goodday.. Is there any different in amps when we do solo run for motor at horizontal and vertical ... A: The only explanation that I can give you is the vertical position allowed the rotor to drop downward ... | |
| star/delta motor | 5/14/2007 |
| Q: Goodday By the way, for star and delta connected motor, any different in amps when we solo run it? A: The result should be nearly identical . Slight difference would occur, but it should not be more ... | |
| Solo run motor vertical and horizontal | 5/14/2007 |
| Q: Goodday.. Is there any different in amps when we do solo run for motor at horizontal and vertical ... A: Most commercial motors are designed and specified for horizontal use. Some are specifically ... | |
| Over voltage/Low voltage | 5/14/2007 |
| Q: Goodday.. Could you explain the effects of the above condition on the electrical equipment and ... A: It is a function of the design engineers goal for the product. But, normally, for most circuits an ... | |
| 1PH, 230V motor | 5/13/2007 |
| Q: I have a 1.5HP, 115/230V pool pump wired at 230V. 0.75HP will be enough power to keep the water ... A: It may burn up the motor, but if it does not the electrical power consumption would be greater than ... | |
| AC Peak detector application? Or missing portion detector? | 5/10/2007 |
| Q: I would like to know what kind of circuit to use to detect when an AC limiter is working. For ... A: Solution one: Use a peak detector IC and calibrate it for the function you are monitoring. For ... | |
| Magnetizing curve of a current transformer | 5/10/2007 |
| Q: why do we have to do magnetizing curve of a current transformer? A: I don't understand the question. If the transformer has an iron core it will have a hysterisis ... | |
| Regarding generator power charecteristics | 5/8/2007 |
| Q: I require a generator to consume mechanical power in linear fashion with speed, i.e., with a ... A: Your requirement maybe a custom made brake. Most of the ones I have personal experience with are for ... | |
| Regarding generator power charecteristics | 5/8/2007 |
| Q: I require a generator to consume mechanical power in linear fashion with speed, i.e., with a ... A: Yes, there are friction brakes that can be attached to the shaft of a generator, also. The output is ... | |
| Regarding generator power charecteristics | 5/7/2007 |
| Q: I require a generator to consume mechanical power in linear fashion with speed, i.e., with a ... A: What? I am not clear on what you mean. If you consider a linear input power, the load on the ... | |
| touchpads | 5/5/2007 |
| Q: I understand how a touch pad works- with a grid forming a magnetic field and your finger ... A: Here is a pretty good explanation of how they work: http://en.wikipedia.org/wiki/Touchpad There ... | |
| Earth and Neutral incorrectly wired - dangers | 5/3/2007 |
| Q: If Earth and Neutral are incorrectly wired what damage could this cause and how dangerous would it ... A: It would depend on what kind of system and what loads were on the line. In most cases, with ... | |
| SELECT A TOPIC TO ME | 5/3/2007 |
| Q: GOODDAY , sir i am the student of the final year(electrical engineering) and there is a specific ... A: And what is your field? EE has many areas: Computer science, communications, power systems, ... | |
| electrical safety- grounded conductor | 5/3/2007 |
| Q: I keep reading that the grounded conductor or "neutral" of a household wiring system is safe to ... A: A circuit must have the same current OUT as IN. So, if you think of a two wire system, the current ... | |
| electrical safety- grounded conductor | 5/3/2007 |
| Q: I keep reading that the grounded conductor or "neutral" of a household wiring system is safe to ... A: Maybe this page will help: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/hsehld.html The ... | |
| dc motor failure | 5/2/2007 |
| Q: one of dc motors failed last week, and the damage was an area behind the risers about 4" square ... A: Yes, I have, but I am not a deeply experienced electrical machinery person. The damage that I have ... | |
| voltage reduction | 5/2/2007 |
| Q: i would like to install a media playing hard drive in to my car, the car battery is: 12V 60Ah and ... A: I recommend you use a dc to dc converter. Something like this: http://www.powerstream.com/dc6.htm ... | |
| question about electrical | 5/2/2007 |
| Q: goodday, i am the student of electrical engineering and there is a problem to caculate the current ... A: power = voltage times current. current = power divided by voltage PF = cosine of voltage over ... | |
| AC Peak detector application? Or missing portion detector? | 5/1/2007 |
| Q: I would like to know what kind of circuit to use to detect when an AC limiter is working. For ... A: Why not tap into the limiter and bring out a line which operates an IC driver to an LED display or ... | |
| Meaning of ampere hour... | 5/1/2007 |
| Q: goodday.. I still can not capture the meaning of battery Ah. Could you explain A: It is a measure of how much electric power is stored in the fully charged battery. If a battery is ... | |
| Battery Charging for jump start | 5/1/2007 |
| Q: goodday.. When we want to jump start battery, why is the sequence are 1.connect + lead to dead ... A: The steps are created for safety and to make sure it is connected properly without error. In a ... | |
| science fair project | 5/1/2007 |
| Q: I would like to do a science fair project that is about soldering because I am good at it. But I ... A: There are many guidelines for beginners on the www. But, they are mostly for advanced students. I ... | |
| Battery Charging | 4/30/2007 |
| Q: Goodday, Battery charger or UPS system, fisrt charging of the battery normally we use Boost Charge. ... A: You must give me a system design. If it is a large system, a few amps may be suitable. If for a ... | |
| rice cooker | 4/30/2007 |
| Q: Goodday How does a rice cooker knows when to off the cooker?(how the cooker knows the rice has been ... A: The rice cooker has a humidity or moisture sensor built in. If you follow the recipe and add the ... | |
| Output equation | 4/30/2007 |
| Q: What must always accompany an output equation for a registered pin? Would this be refering to a ... A: Can you give me a more specific question? Are you asking about a logic IC? If so, then yes, the ... | |
| Digital Circuit | 4/30/2007 |
| Q: Does the logic analyzer rely on a known bit pattern to test for proper operation of a digital ... A: Yes, and No. A logic analyzer has many built in patterns and also has a learning ability to look at ... | |
| Earth Fault | 4/29/2007 |
| Q: Regarding earth fault, here one of the rectifier might have problem with the cables etc (we do not ... A: A certain ground fault can cause current to flow to ground which would cause the system to think ... | |
| MOV motor with multiple torque | 4/29/2007 |
| Q: Goodday, Nice holiday u have? Just one question I want to ask. Actually this came across my mind ... A: Torque and speed (rpm) and horsepower are inter-related by a simple equation. See this page: ... | |
| Aircond | 4/29/2007 |
| Q: Goodday, For Aircond, we have start and run capacitor. But for both capacitors, what is the ... A: http://ww1.microchip.com/downloads/en/AppNotes/00967A.pdf The above web shows a few equivalent ... | |
| Battery Charging | 4/29/2007 |
| Q: Goodday, Battery charger or UPS system, fisrt charging of the battery normally we use Boost Charge. ... A: No, the charging current tapers off as the battery becomes fully charged. The function of the ... | |
| Aircond | 4/29/2007 |
| Q: Goodday, For Aircond, we have start and run capacitor. But for both capacitors, what is the ... A: During start phase there is heavy load and circuit is very inductive. Capacitor is to keep currents ... | |
| Aircond starter | 4/6/2007 |
| Q: Goodday Some questions regarding aircond. 1. What does it means with Crank Case Heater? 2. The use ... A: The engine has a crankcase which hold the oil for lubricationg the internal engine parts. If it is ... | |
| Harmonics | 4/6/2007 |
| Q: Goodday What does harmonic in electrical refers to and why we want to eliminate them? A: Harmonics are important; they tell us what a waveform should look like. I don't know what you are ... | |
| Electric motor rotation | 4/6/2007 |
| Q: Cleggsan I have this electric motor that I took off of a paper shredder machine. Since I did not ... A: But the paper shredder has a make and model? Then we can look it up. You must go back to the ... | |
| Electric motor rotation | 4/5/2007 |
| Q: Cleggsan I have this electric motor that I took off of a paper shredder machine. Since I did not ... A: You speak as though you have a dc motor on hand. But, paper shredders are ac motors. And you ... | |
| power costs | 4/5/2007 |
| Q: This may be a very easy or difficult question. I am trying to basically find out power consumption ... A: 1. The curtain (you said "certain", I am assuming it was a misspelling) will have mass and size and ... | |
| Charging Swuitch over | 4/2/2007 |
| Q: Goodday Here we have a charger which charges 2 banks of battery. The system is operating where for ... A: Can you give the battery charging specifications and the charger current ratings? That way I can ... | |
| Compatibility Of Old Component with New One | 4/1/2007 |
| Q: Goodday.. One question seek for advice. For example we have an old aircond system, let say 20 years ... A: Technology, design and manufacturing have improved greatly over the years. In the 20 years ... | |
| electric wires | 4/1/2007 |
| Q: So glad this site exists, thx a mil ! Im trying to change a "plug head", that goes into a Lacie ... A: I can guess, but to know for sure you must know the electrical interface. The schematic or wiring ... | |
| AC and DC Capacitor | 4/1/2007 |
| Q: Goodday.. For UPS inverter or rectifier, there are AC and DC capacitor. From what I know, capacitor ... A: A capacitor is a capacitor; it is a storage device with two plates, which when charged, hold that ... | |
| 1 or 3 phase carbon brush | 4/1/2007 |
| Q: Goodday Looking at example or anywhere I can, when talking about the generator, I saw only one ... A: Depends on the internal wiring of the generator windings. If they are separate windings then you ... | |
| Compatibility Of Old Component with New One | 4/1/2007 |
| Q: Goodday.. One question seek for advice. For example we have an old aircond system, let say 20 years ... A: Surely after 20 years the technical characteristics and parameters have changed. Newer compressors ... | |
| Battery Charging Amps | 3/31/2007 |
| Q: Goodday Cleggsan... I was told there is rule of thumb for battery charging amps. For Nicad is 25%xAh ... A: In my experience there is great danger in following any rule of thumb for batteries. Most ... | |
| 4-20mA Loop System | 3/31/2007 |
| Q: Goodday to you Cleggsan.... For a 4-20mA loop we have 4 major components those are the ... A: 1. A sensor is a transducer in most cases. Most often a sensor is a special type of transducer. ... | |
| AVR | 3/28/2007 |
| Q: "A voltage regulator does, just what it's name implies, it regulates the output voltage of the ... A: There are AC and DC voltage and AC and DC current regulators. And, they are all quite different in ... | |
| Carbon brush function | 3/27/2007 |
| Q: Goodday.. What are the function of carbon brush? A: And good day to you! http://www.morganite.com/what.htm ... | |
| SCR / Thristor Rectifier | 3/27/2007 |
| Q: Goodday.. For SCR or Thyristor rectifier, both will have a gate signal. My question is , what is ... A: You can think of an SCR as a diode with a gate switch. The SCR is OFF until the gate biases it on ... | |
| Large Application Diode Test | 3/26/2007 |
| Q: 1.if we disconnected diode for large application, and we put the + lead at anode and - at cathode, ... A: DMM are not a good instrument to test diodes because their internal battery voltage is not ... | |
| Diode For Generator | 3/25/2007 |
| Q: Goodday As we all know when we measure the diode the reading should be 0.7V for Si. But for abig ... A: Silicon diode junctions go into forward bias at around 0.6 to 0.7 volts. If you look at the Voltage ... | |
| Motor Solo Run | 3/25/2007 |
| Q: Goodday 1. What is the purpose of doing motor solo run test. Can it determine whether the motor is ... A: Motor solo runs and test runs can have several purposes. - Verification the motor is working ... | |
| Earthing Clamp | 3/25/2007 |
| Q: SOME PLACE STILL USING THE CONVENSIONAL WAY WHERE THE EATH ROD AND THE ADJACENT ROD ARE CONNECTED ... A: Electrical connections, especially where high currents are involved, must be very, very low ... | |
| BRUSHLESS GENERATOR | 3/25/2007 |
| Q: GOODDAY MR CLEGGSAN 1. WHAT IS MEANT BY BRUSHLESS GENERATOR? 2. HERE WE HAVE BRUSHLESS GENERATOR ... A: It is helpful for me to understand more clearly what field you are working in and the type of ... | |
| BRUSHLESS GENERATOR | 3/24/2007 |
| Q: GOODDAY MR CLEGGSAN 1. WHAT IS MEANT BY BRUSHLESS GENERATOR? 2. HERE WE HAVE BRUSHLESS GENERATOR ... A: Is this the kind you are talking about? http://www.ecycle.com/motorgenerator/MG.htm In any event, ... | |
| CT meter | 3/24/2007 |
| Q: I'm trustee for a Baptist Association building. The city utilities are charging us a demand rate ... A: I don't know the answer, sorry. I understand perfectly what your dilemma is. The power company ... | |
| Motor Mounting And vib | 3/23/2007 |
| Q: i heard for motor that is mounted vertical is more prone to vibration.Is it true and why? What ... A: It is so much depending on the internal construction of the motor. Some motors are designed for ... | |
| Diesel engine cranking using battery | 3/23/2007 |
| Q: We have 2 banks system with Auto Start and Manual Function. If we start the engine manuaaly for bank ... A: This is an application specific question. It really depends on the design of the system ... | |
| Ammeter selectiion | 3/23/2007 |
| Q: If we refer to LV Motor Drawing, there is CT Ratio let say 150/1 and also at the bootom there is ... A: Seems to me you will need different ammeters for the primary and secondary. Some digital ammeters, ... | |
| Final Anode | 3/22/2007 |
| Q: This link shows the inside of a TV set: http://electronics.howstuffworks.com/tv5.htm The middle ... A: Not too sure what black can you are asking about. There are cages in most tvs that contain the ... | |
| Motor Amps Fluctuate | 3/22/2007 |
| Q: We have 132kW LV motor ,380V, rated amps around 250A but running amps is below 190A. Now from our ... A: Those figures are not a really big variance. Could be accounted for by just slight differences in ... | |
| Electrical Engineering | 3/22/2007 |
| Q: My name is John. I'm a high school student that is interested in electrical engineering. I would ... A: There is great demand for electrical engineers of all kinds. It is an outstanding career choice. ... | |
| Motor Running Amps Unbalance | 3/22/2007 |
| Q: If the motor is running under unbalnce ampere condition, let say for R is 70A, Y is 80A and B is ... A: If the unbalance condition does not exceed the nominal running ratings you should be okey. But, ... | |
| CT Ratio and Ammeter Selection | 3/21/2007 |
| Q: 1.I refer to the motor control drawing. In the drawing there is a CT ratio and also ammeter range. ... A: CT ratio is the ratio of primary current to maximum secondary current under full load conditions. ... | |
| Motor Amps Fluctuate | 3/21/2007 |
| Q: We have 132kW LV motor ,380V, rated amps around 250A but running amps is below 190A. Now from our ... A: Oh yes. I don't think that is an abnormal fluctuation at all. If the load is fluctuating, the ... | |
| Battery Excessive Charging Amps | 3/20/2007 |
| Q: Here we have 2 banks of batteries. One is new and one is old. But both show charging amps of ... A: I don't know the big battery business so much anymore. It has been a few years since I delved into ... | |
| Battery Excessive Charging Amps | 3/20/2007 |
| Q: Here we have 2 banks of batteries. One is new and one is old. But both show charging amps of ... A: Internal circuit is inside the battery. There are connections between the cells that use bars or ... | |
| Battery Excessive Charging Amps | 3/20/2007 |
| Q: Here we have 2 banks of batteries. One is new and one is old. But both show charging amps of ... A: There are many causes of excessive charging current. But, assuming you have verified it to be the ... | |
| Piezoelectric | 3/20/2007 |
| Q: How does this sensor works and use for what purpose? A: Piezoelectric devices are broadly used for sensors and voltage generating devices. The basic action ... | |
| Motor Vib | 3/19/2007 |
| Q: I noticed on the vib pen display there is a display for vib in unit XX mm/s and there is another one ... A: Yes, got it. g/s is the acceleration of the vibration mode; in other words it is measuring how ... | |
| cable coating | 3/19/2007 |
| Q: 1.Does cable coating can prolong the life of cables especislly cables 20 years in ages? 2.When we ... A: The coatings that I am familiar with are for retarding flame spread in case of fire and for rodent ... | |
| Motor Vib | 3/19/2007 |
| Q: I noticed on the vib pen display there is a display for vib in unit XX mm/s and there is another one ... A: Don't know. Can you give me a clue what kind of equipment you are talking about? Do you have a ... | |
| Generator Self-Excitation | 3/18/2007 |
| Q: Here in our plant we use gas turbine generator with DC excitation. As we know the voltage induced in ... A: No, not the windings. The winding wires are usually copper (or in some cases aluminum). The iron ... | |
| Generator Self-Excitation | 3/18/2007 |
| Q: Here in our plant we use gas turbine generator with DC excitation. As we know the voltage induced in ... A: Yes, of course, with magnetic materials there can always be remanance or remaining magnetic field in ... | |
| Data aquesition | 3/17/2007 |
| Q: I m an electronics engineering undergraduate.I want the information about following two fields. ... A: I am not expert with labview modeling system. http://zone.ni.com/devzone/cda/tut/p/id/4566 The ... | |
| Generator Excitation and Voltage | 3/17/2007 |
| Q: Here in our plant we use gas turbine generator with DC excitation. As we know the voltage induced in ... A: Of course! Unless there are limitations built into it by the manufacturer. But, if the system is ... | |
| Motor Winding Insulation Test | 3/16/2007 |
| Q: For a delta connected motor, when we test the phase to earth insulation, we do not need to ... A: Generally, the earth to windings is sufficient. However, in electric circuits you quickly learn that ... | |
| Battery Charginbg Amps | 3/16/2007 |
| Q: What is meant by pressure test for cabels? I heard the inject around 1000V into the cable. What can ... A: No; there are no rules of thumb. It is totally dependent upon the unique characteristics of the ... | |
| Switch Rating | 3/15/2007 |
| Q: What do the following SPDT switch ratings mean: 1A 125 VT, 6A 125 VL, 6A 125VAC, 3A 250VAC I am ... A: SPDT means it is a Single Pole, Double Throw switch. Here is a nice pictoral of the SPDT along with ... | |
| Cable presure test | 3/14/2007 |
| Q: What is meant by pressure test for cabels? I heard the inject around 1000V into the cable. What can ... A: Depends on the context. It may refer to VOLTAGE pressure or it may refer to gas pressure. Some ... | |
| Metal Oxide Varistor (MOV) | 3/13/2007 |
| Q: The most commonly use and already proven technology to reduce the transient voltage ie from ... A: It is a form of semiconductor. The device has a threshold voltage that, when a transient spike ... | |
| Leakage Current Flow II | 3/11/2007 |
| Q: If there is leakage in the elctrical system, the current we flow to the ground and return to the ... A: Leakage always must go somewhere. It cannot just magically poof into the air (well, actually, when ... | |
| Leakage Current Flow | 3/11/2007 |
| Q: If there is leakage in the elctrical system, the current we flow to the ground and return to the ... A: Leakage current can be anywhere; on any leg to the ground or neutral OR to another leg. Mostly, in ... | |
| Parallel and Series LC circuits | 3/7/2007 |
| Q: For my physics project I need to go into more depth about the physics behind why a parallel LC ... A: Well, first you must understand that in a parallel circuit the impedance is equal to the product ... | |
| Aircond Compressor | 3/7/2007 |
| Q: What are the main reason causing the compressor to trip? Could you brief ly explain how is the ... A: Yes, it is for proper control of the systems safety and normal operation. If refrigerant is too ... | |
| Motor Abnormal Noise/Noisy | 3/7/2007 |
| Q: What is the main cause for motor to be noisy and how can we recognize it ie from the amps, vibration ... A: Two kinds of noise are associated with motors: ONE: Electromagnetic radiation from current ... | |
| Lightning Characteristics | 3/7/2007 |
| Q: when talking or reading about lifghtning, I came across this 8/20us, 10/100us. What does this ... A: This is a impulse rating for a surge (line surge or lightning surge) test that is used to simulate ... | |
| "Dry contact" | 3/7/2007 |
| Q: I always heard about 'dry contact'. What is meant by this? A: Dry contact usually (but there are other meanings in other industries) refers to an extra pair of ... | |
| Chips & Circuits | 3/6/2007 |
| Q: I will do some more looking. The testing software I am thinking of is called CircuitMaker and ... A: Your follow up was much more useful to me than the original. Try: ... | |
| Chips & Circuits | 3/2/2007 |
| Q: I am trying to create a special digital binary clock. A friend had suggested that I use a ... A: Maybe this is what you are looking for: http://electronicsusa.com/ There are several kits and ... | |
| electronics | 2/23/2007 |
| Q: 1a)for what voltage will the reverse current in a pn junction silicon diode reach 95% of its ... A: These parameters are specific to the diode. You must know the 1N number and then look up the ... | |
| Makeshift Adapter - Will This Work | 2/22/2007 |
| Q: C, Many thanks! I live in Australia and bought the scanner in the States, and probably killed the ... A: The photo you referenced only solved half the problem: It clearly shows the scanner power connector ... | |
| Makeshift Adapter - Will This Work | 2/22/2007 |
| Q: I have a scanner without the power adapter. The specs say rated voltage 24V DC and rated current ... A: It is more than just a current and voltage rating; but also the regulation or voltage curve with ... | |
| CE amplifier | 2/20/2007 |
| Q: I want to design a CE amplifier with the a voltage gain of -50 ? Where should i start by assembling ... A: See my previous answer for component values. Lay the components out so as to connect to the ... | |
| CE amplifier | 2/20/2007 |
| Q: Given the voltage gain & Vcc of transistor amplifier(CE or CB) how can I design it with its ... A: Do you want a voltage gain of 50? or 0.50? Actually, 0.50 is not a gain, rather it is an ... | |
| electrical | 2/20/2007 |
| Q: i count find the answer in which u have send the links. so pl sen me explanation of the answer.what ... A: "The basis for most low and zero speed sensorless control is that there exist a difference in the ... | |
| electric baseboard heating | 2/19/2007 |
| Q: I have an electric baseboard heater built in to the wall (that needs to be replaced) that is 120 ... A: Yes, it is possible; however, you will need an electrician to come into the house and rewire the ... | |
| electrical | 2/18/2007 |
| Q: What are the technical reasons for soaking transformers for various times before allowing them to ... A: The soaking process is to determine the sufficiency of the cooling oil for continuous operation ... | |
| electrical | 2/18/2007 |
| Q: what is the reason of power development in synchronous generator due to saliency ? A: Not sure I understand the question. See if this is helpful: ... | |
| cables | 2/18/2007 |
| Q: How do you detect the exact location of a cable fault if its cable puncture? A: There are many tools that have been developed over the years. The telephone industry and utility ... | |
| electrical | 2/18/2007 |
| Q: why the suply frequency in INDIA is 50HZ A: It is an arbitrary decision made by the original system designers. Most of Europe and parts of Asia ... | |
| bicycle generator | 2/18/2007 |
| Q: me again. I now have 2 options. I actually got a 1000v diode with a 1amp rating. I know that it ... A: First, 1 amp is not sufficient. If you get a strong charging current it could be as much as 12 amps ... | |
| electrical | 2/17/2007 |
| Q: what is the difference between earth and neutral A: Earth is a ground reference point; in electrical systems the main reference is generally earth - ... | |
| electronics | 2/17/2007 |
| Q: Why Transistors are not used as switching devices? A: They are. Many logic ICs are based on transistor switchting. There are many products that employ ... | |
| electrical | 2/17/2007 |
| Q: earth has the constant potential so we take it as reference.but in steo & touch voltage we use to ... A: Earth is a reference point. And, some current does flow through ground; depends on the circuit, the ... | |
| powersystems | 2/17/2007 |
| Q: What is the difference between Earthing & grounding A: Usually different country terminology. In the UK they like to use Earthing. In the USA the like to ... | |
| Bicycle Generator | 1/27/2007 |
| Q: I recently put together a bicycle generator. I used a 12v fan motor for my generator. I can power a ... A: Good question. Easy answer. Get a good 100v diode with a rating of at least 20amps and put it in ... | |
| RTD | 1/25/2007 |
| Q: Goodday Dave I have questions regarding RTD. I guess we can consider it as a sensor. First of all, ... A: There are many types, kinds and brands of such resistive devices. Could you be a little more ... | |
| ELCB/RCD | 1/24/2007 |
| Q: Can ELCB trip if we supply DC in to it? A: I don't know that much about this meter/tester, but a small amount of dc should not do anything. ... | |
| Speakers | 1/24/2007 |
| Q: I'm not sure you are the right person to ask about this but this site is kind of complicated to ... A: I suggest an EE degree at a strong university. Designing of loudspeakers is a cross between ... | |
| Inductance effect created by losose connection | 1/23/2007 |
| Q: In the earthing system, much of the inductance effects are introduced by the condition of the ... A: Sorry, I don't know anything about this subject. Loose connection, generally speaking, is more a ... | |
| Discharge Test | 1/22/2007 |
| Q: Does discharge test the same as loadbank test? When we cary out the test, what are our guideline to ... A: Discharge test is when you place a safe load on the cells and discharge them to zero. Testing the ... | |
| Controlling of I,V charging | 1/22/2007 |
| Q: To prevent the battery from overcharging we control the I,V. But how we do the controlling actually? ... A: Undercharging will just not allow the battery system to get to full charge. The power supply is ... | |
| Effect of Temperature on Battery Lifespan | 1/22/2007 |
| Q: How does battery can be affected by the high/low temperature especially batteries used for UPS ... A: Heat or high temperature is never good for anything electrical or electronic. The higher the ... | |
| Meggering a Cable | 1/21/2007 |
| Q: When we do meggerig, why wemust disconnect both ends? And what happen if we let the other end ... A: http://en.wikipedia.org/wiki/Megger The above is a basic explanation of a Megger (named after a ... | |
| Generator reverse Power | 1/21/2007 |
| Q: How can a generator reverse the process and become a motor. The generator is connected to 6kV busbar ... A: A generator and motor are similar in construction: A stationary field coil around the outside of ... | |
| Thermocouple | 1/21/2007 |
| Q: A few days back, i saw an instrument engineer use a meter to check a thermocouple. I was told the ... A: Well, there are so many meters. A curve tracer can be used to show the resistance curve, in the ... | |
| Power system | 1/21/2007 |
| Q: 1.What is meant by negative &v positive sequence impedance, voltage,current? How to visualize these ... A: ONE: http://en.wikipedia.org/wiki/Negative_resistance The above page is a general discussion on ... | |
| AC/DC adaptors | 1/18/2007 |
| Q: My original AC/DC adaptor for my wireless mic system is 'Input 120V AC 60hz 8W / Output 12V DC ... A: I would have to know the make and model of the wireless mic system to give you a good answer. That ... | |
| Metering and Switchboards | 1/18/2007 |
| Q: I took a test for a job interview last week. I scored pretty high, and they are actively considering ... A: 1. I really don't know much about these classes. A good discussion follows in the center of the ... | |
| RTD Pt 100 | 1/3/2007 |
| Q: How does RTD hooked up to the motor winding? A: An RTD is a resistive temperature sensitive device used to monitor the temperature. They can be ... | |
| Load bank test | 1/3/2007 |
| Q: For a 12V, 400Ah battery for example when we are doing discharge test/load test, how can we ... A: It is usually a big wire wound resistance built into the test such that when both terminals of the ... | |
| HIC Control | 1/3/2007 |
| Q: I do not understand what and how HIC control operates. This can be used with actuator to give the ... A: I don't know the term HIC. A signal at that level is probably a control signal coming back from a ... | |
| DC-DC converter with MOSFET/IGBT | 1/3/2007 |
| Q: I noticed in most dc-dc converter, they use flyback converter ( correct me if i wrong ). There is ... A: 1. Mosfet is economical and easy to design with little heat loss, or less than other type devices. ... | |
| heaters | 1/1/2007 |
| Q: Thanks to you, I now know for sure that electrical heaters use up more electricity than other ... A: It depends on the ratings and the thermostatic sensitivity and the size of the room. IF: Any two ... | |
| transformer | 1/1/2007 |
| Q: i am really confused about the equivelant circuit of the transformer i want to know how it works ... A: Equivalent circuit is just a circuit of conventional components comprised of resistors, capacitors ... | |
| Electricity generation | 12/30/2006 |
| Q: Is it possible to use a low drawing electric motor to generate a greater supply of electricity ... A: I don't think so. The efficiency of conversion from the big monopoly electric producers is much ... | |
| Electricity generation | 12/29/2006 |
| Q: Is it possible to use a low drawing electric motor to generate a greater supply of electricity ... A: I don't understand the question. But, if you are asking can an electric motor become a generator the ... | |
| heaters | 12/28/2006 |
| Q: I think I understand most of what it contained. However,concerning the area of which type of heater ... A: Electric heaters DO use more power (watts) than most appliances because they are steadily consuming ... | |
| heaters | 12/27/2006 |
| Q: I would like to know in just a little detail what the differences are between fan,convector and ... A: Well, last question first: Heat is heat and power is power. Electrical power is in watts. It is ... | |
| RTD And electrical heater | 12/26/2006 |
| Q: How are the RTDs connected to the winding let say a motor. Is it hook up like the current ... A: Temperature dependent resistors are used in a motor for protection such that when the temperature ... | |
| Generator as a motor. | 12/25/2006 |
| Q: Generator as a motor. Our generator is connected to 6kV busbar. Normal operation would be the ... A: Most generators have switching circuits that reconfigure the winding connections for motor use. ... | |
| Voltage Drop Effects | 12/25/2006 |
| Q: Let say according to design I have to install a cable with voltage drop 5V/m. For a distance about ... A: Simple, the voltage drop will be more or less, depending on what gauge wiring you are using. The ... | |
| Gas Turbine Gen | 12/25/2006 |
| Q: 1.In the protection system of generator, there is under/over frequency relay. How does this relay ... A: I think my previous question answered this. The automatic controls are very sophisticated ... | |
| Gas Turbine Generator | 12/24/2006 |
| Q: 1.In the protection system of generator, there is under/over frequency relay. How does this relay ... A: The relay is to cut out if the frequency shifts too far away from the line it is connected to. The ... | |
| ICCP System and Sacrificial Anode | 12/24/2006 |
| Q: 1.In our plant we use ICCP system. L:et say I install 10 sacrificial anodes at 10 points. So one ... A: I am still not too sure which system you are talking about, but most corrosion and connection/bus ... | |
| Impressed Current Cathodic Protection And Sacrificial Anode | 12/24/2006 |
| Q: In our plant we use ICCP system.We placed several sacrificial anodes (10) at several points(10).Let ... A: Sorry, I must know which system you are talking about. This kind of system: ... | |
| wireway calculations | 12/21/2006 |
| Q: It might seems like I am gonna ask to do my homework but it is not.Currently I am studying NEC ... A: Sorry, I can't help on this one. I don't have the National Electric Code requirements handy and I am ... | |
| PWM concept and inverter | 12/20/2006 |
| Q: I was told the output of PWM is a sequence of squarewave.This squarewave actually come from the AC ... A: http://www.cpemma.co.uk/pwm.html The above is a good tutorial on how PWM works. ... | |
| PWM concept and inverter | 12/19/2006 |
| Q: Most inverter use PWM concept.TYhe output of itis a square wave, but how can it(squarewave) relates ... A: PWM or pulse width modulation is a means whereby the amount of energy is controlled by the width of ... | |
| UPS Inverter Failure | 12/19/2006 |
| Q: I do not really understand the answer for nomber 1.Could you clarify?...from loading the ... A: A short circuit is an overload. The most sever overload since the load impedance is "zero". Any ... | |
| AC/DC Relay Circuit | 12/18/2006 |
| Q: You may or may not want to answer this question, but let me give you a little background first. My ... A: Relays with external contacts for switching will hand the ac just fine. All you need is a very ... | |
| overheating transformers | 12/18/2006 |
| Q: I have a customer with a strange problem. In a high-rise hotel he has a 480v buss riser. On every ... A: Well, you may have confused the readings OR the lines are mismarked and the A phase and C phase are ... | |
| Shorted Battery | 12/18/2006 |
| Q: We know the negative plate and positive plate in a battery separated by separator.So how can these ... A: First let me refer you to this site for a quick review of battery operation: ... | |
| UPS Inverter Failure | 12/18/2006 |
| Q: Questions regarding UPS 1.There are many causes can make the inverter in UPS to fail.Among them are ... A: http://www.ybet.be/en-hardware-2-12/ups.htm The above may help with an overview of ups ... | |
| Liquid conductivity | 12/17/2006 |
| Q: I have a unique problem that I am at a loss to resolve. I have a couple of ideas but am unsure if ... A: So, you want to know the routing of the vinyl tubes so that you can cut into the floor and avoid ... | |
| UPS | 12/17/2006 |
| Q: most of gutor and UPS use thyristor,scr.but i do not understand the operation of thyristor ... A: Oh, here is the deal on a thyristor: http://en.wikipedia.org/wiki/Thyristor Thyristors, scrs and ... | |
| Meggering | 12/17/2006 |
| Q: Just now I meggered a compressor winding for 15 HP AC.Two compressores actually.For compressor 1, ... A: that helps. I suggest you, also, using a plain and simple vom, check for shorts to the case, shorts ... | |
| DC generator output at variable RPM | 12/16/2006 |
| Q: I have a self-made wind turbine (daughter's project) with a 12VDC 10amp motor/generator attached to ... A: Resistive load would be in ohms. Is the load a 10 ohm resistor? (E = I*R, or R = E/I = 3v/.3a = 10 ... | |
| Meggering | 12/16/2006 |
| Q: Just now I meggered a compressor winding for 15 HP AC.Two compressores actually.For compressor 1, ... A: I am confused. Meggering is usually for testing insulation qualities from windings to case or ... | |
| UPS | 12/16/2006 |
| Q: 1.Most of the UPS use this thirystor bridge rectifier that hac something we call firing pulse.What ... A: You did not send me the make and model you are talking about. Not all ups circuits are the same. ... | |
| UPS | 12/15/2006 |
| Q: For UPS normally we are using Lead acid/Nicad or VRLA battery.Could you exolain the VRLA? And what ... A: Valve Regulated Lead Acid batteries are designed for rugged, compact use. They use tougher ... | |
| Experiment to find Inductance of inductor | 12/14/2006 |
| Q: This is one of a series of experiments for a project, this one is to calculate the inductance of an ... A: Yes, that is true only if the R is equal to the inductive reactance. It may be a better choice to ... | |
| Stymied on how to calculate this | 12/13/2006 |
| Q: I wanted to know if you take an acyclic generator homopolar generator (faraday disk high current low ... A: Let me repeat: If the generators are connected in a series circuit the current must be the same in ... | |
| Samsung TV Convergence problems | 12/13/2006 |
| Q: Now the TV will not turn on, therefore no audio or video. I can hear it attempt to start up and then ... A: As you know, diagnosing long distance without seeing the symptoms is, at best, a guessing game to ... | |
| Stymied on how to calculate this | 12/13/2006 |
| Q: I wanted to know if you take an acyclic generator homopolar generator (faraday disk high current low ... A: Nice discussion on the Faraday disc generator at: http://en.wikipedia.org/wiki/Homopolar_generator ... | |
| Samsung TV Convergence problems | 12/12/2006 |
| Q: Suddenly the screen on my Samsung HCN4226W arched at the top and colors red, blue and green became ... A: Yes, I would say it is a failure of the STK ICs in the convergence circuitry. They must be replaced ... | |
| UPS | 12/11/2006 |
| Q: 1.How can a capacitor boost the starting for motor.From what I know the capacitor functions are to ... A: Yes, that is true, but there is lead and lag in the capacitor as it takes time to store the energy ... | |
| UPS | 12/11/2006 |
| Q: 1.Why cant we connect UPS neutral with the main neutral bar? 2.How do we check at the UPS the ... A: 1. You can if you want to. However, then it is tied to the supply lines through the ground and ... | |
| d.c motor,generator and a.c motor, generator | 12/11/2006 |
| Q: uses of dc, a.c generator and motor in industries applications and formulaes A: Do you have a question? Motors and generators come in many, many sizes, shapes and designs. They ... | |
| Generator Exciter and Diode | 12/10/2006 |
| Q: 1.What are the fucntions of the exciter in gas turbine generator? 2.What are the fucntions of the ... A: Exciter controls the magnetic field in the generator system and controls the output voltage and/or ... | |
| Electric motors | 12/8/2006 |
| Q: I am not sure the questions that I have need to be directed to a person with your back round or if ... A: Yes, this is out of my direct area; but an interesting question. It is one that I would delve into ... | |
| question | 12/8/2006 |
| Q: what is exciter and its uses? A: There are many exciters - a term used in computers, radio, power, microwave, etc. For example, in ... | |
| electricity | 12/7/2006 |
| Q: what is the difference between electronic current and conventional current? how these two currents ... A: No difference; maybe just different terminology being used. Current is current; it only comes in ... | |
| electricity | 12/6/2006 |
| Q: what will happen if we provide dc to a bulb instead of ac? A: If it is an incandescent lamp and you apply the same voltage it will make no difference. If it is a ... | |
| thevenin | 12/6/2006 |
| Q: i always finds a difficulty to find out the equivalent thevenin's voltage of the circuit.....also by ... A: Thevenin's theorem states simply that in a linear circuit the entire complex circuit can be ... | |
| Electric Motor simulation. | 12/5/2006 |
| Q: I am trying to simulate how a motor controller circuit responds when attached to a motor. It is a 3 ... A: This site has some good ideas for what you are doing: ... | |
| MAGNETISM | 12/5/2006 |
| Q: what is the use of magnetism in aircraft system? A: Everywhere! Generators, alternators, position sensors and detectors, meters, transducers and so on. ... | |
| a blinking light bulb | 12/5/2006 |
| Q: I want to know how to make a simple light bulb(40-100W) blink, not neseseraly in equal intervals but ... A: Yes, it is very possible. Don't know if it is simple, however. There are many solutions. - IC ... | |
| magnetism | 12/3/2006 |
| Q: I wondered if you have any infomation on the advantages/disadvantages that electro magnets have over ... A: This is an applications matter. An electromagnet requires an external field and thus a power ... | |
| dc machine | 11/19/2006 |
| Q: can dc motors work as a dc generators? if it is so then what is the need to buy them separately? A: Yes, and no. Depends so much on their construction and purpose. There are some that are designed ... | |
| dc motor and generator | 11/19/2006 |
| Q: what will happen if we give ac supply to a dc motor or generator? will it work or not? A: Some to; some don't. It depends so much on the way the windings are built and the relation of the ... | |
| npn turning on leds | 11/16/2006 |
| Q: It's just a switch to turn on 2 LEDs in series. It's used in a Sharper Image radio, when you turn ... A: Since the lytic cap is rated at 12v it is likely the zeners are voltage protection for something ... | |
| npn turning on leds | 11/16/2006 |
| Q: broke a couple of zeners - now I can't read part#. npn transistor (9013) - c going to 12V, e going ... A: Without knowing more of the circuit/application it would be a guess on my part. Can you help me ... | |
| power system | 10/27/2006 |
| Q: 1)plz tell me ,if square wave is given to the primary of a transformer then what is the wave will ... A: 1) Depends on the bandpass of the transformer. A square wave is composed of the principle sine wave ... | |
| ac to ac conversion | 10/27/2006 |
| Q: how can i convert single phase to three phase ckt.plz reply A: Please do a google search on this and you will find several options. There are many ways to ... | |
| DC MACHINE | 10/27/2006 |
| Q: i have a problem on dc machine.my question is "what is the rotating principle of dc motor and dc ... A: Magnetic fields and forces created by coils of wires inside the magnetic field. See ... | |
| Low RPM permanent magnet direct drive generator | 10/26/2006 |
| Q: When you see an off the shelf generator with a power rating of 10k does that mean per second, ... A: 10K what? Power is usually in watts or Kwatts. It is usually stamped on the name plate in a box for ... | |
| 6th grader | 10/26/2006 |
| Q: i am doing my science fair project but having trouble coming up with resources. my questions is... ... A: Not sure if you are asking if the weight OF the wire or the weight ON the wire effects current flow. ... | |
| LED flashlights | 10/26/2006 |
| Q: I have been looking at the advertised specs for some high-brightness LED flashlights, and I have ... A: http://www.equipped.com/led_lights.htm http://www.flashlightreviews.com/reviews/fenix_e0.htm The ... | |
| Electric field difference | 10/25/2006 |
| Q: I think I may be missing the point somewhere.... If I take a battery (source of emf), the battery ... A: What? No, there is no meaningful electric field around the terminal or the resistors. I think you ... | |
| Alternator brushes | 10/24/2006 |
| Q: What will be the maximum current that will flow through the copper brushes?How can we determine the ... A: Lots of current and switching transients. Peak currents can be very high; average current not so ... | |
| Transformers | 10/24/2006 |
| Q: In case of transformers, when no load connected to secondary, does it affect power factor of ... A: If there is no load on the secondary then there is no current flowing and the only losses to the ... | |