| Subject | Date Asked |
|
| 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 ...
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| 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: ...
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| 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 ...
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| 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, ...
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| 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 ...
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| 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) ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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: ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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, ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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: ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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: ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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, ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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: ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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: ...
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| 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 ...
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| 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 ...
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| 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; + ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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, ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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: ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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, ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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: ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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: ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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: ...
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| 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. ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
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| 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 ...
|
| Digital art table advice | 10/21/2006 |
Q: I have an out of the ordinary "Do it yourself" project in front of me that's almost more of a ...
A: Good Project. Will keep you up nights for a long time. (BTW: The arc/color bowing problem you ...
|
| Alternator brushes | 10/19/2006 |
Q: What is the role of copper brushes in alternators? Is there anything with which we can use that as ...
A: You can use any material you want. HOWEVER: the reason copper is used is because of its very low ...
|
| Potential difference | 10/18/2006 |
Q: this is a REALLY easy question to ask but i just cant grasp the idea of electronics, and was working ...
A: Here is the key: Voltage is always "across" it never goes "through". Current is always "through" ...
|
| voltamps | 10/18/2006 |
Q: Cleggsan Relays are AC. They will operate at the same time. Purpose of the program is to turn on ...
A: The use of VA or volt.amps is getting more common now days to denote that it is volts time current - ...
|
| 120v to 220v for hot tub | 10/15/2006 |
Q: I am looking to get a hot tub that requires 220v outlet to operate. The space I would like to put ...
A: There is only one option, in my opinion: Call in a licensed professional electricion and have the ...
|
| Delta system phase to ground voltage | 10/15/2006 |
Q: My system measured all other motors that same day without a problem, so that is why I think ...
A: That is important. If identical motors measure differently from each other that is a sign of some ...
|
| Electrical cable sizing | 10/14/2006 |
Q: Sir: I'm installing a hobby greenhouse approximately 50 feet behind my workshop. Total run from ...
A: 10 gauge would be best. The problem with lower gauge wire is you get voltage drop across it and ...
|
| Too much current drawn, voltage drop. | 10/14/2006 |
Q: i'm working on a project where my servo motor (HS 422) has to respond to instructions from a DAQ ...
A: Yes. The current requirement is, in the most part, a function of the loading on the shaft of the ...
|
| Voltage | 10/13/2006 |
Q: The machine in question in a donut making machine. It is a US standard 115V AC... plugs into any ...
A: There is nothing you can do about speed with the machine from the USA unless you can change the ...
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| Voltage | 10/13/2006 |
Q: I am buying a machine from the US that runs on 110-115V, but I am in Singapore where machines run on ...
A: http://www.expatsingapore.com/faq/faqother.shtml See the discussion above. You said machine: That ...
|
| Voltage limiter | 10/13/2006 |
Q: Hey again, thanks for your reply. Yes, 20A is the peak current, not the average current. I just ...
A: Here are some pretty hefty IGBTs that may be a good choice for such a switching system, also. ...
|
| generator power | 10/13/2006 |
Q: I have a 40 kw generator that puts out 120 volts on each phase with no load. As load is applied the ...
A: The voltage drop is caused by excessive current. What kind of loads are you putting on the ...
|
| Voltage limiter | 10/12/2006 |
Q: I an Eng. Undergrad in my final year. My FY project is concerned with the start-up of a model jet ...
A: http://www.farcircuits.net/power2.htm The above has a few ideas for you. Do you really mean 20 ...
|
| Future | 10/11/2006 |
Q: Actually my question is not about a problem that i have faced in working with an electrical ...
A: It is the same, nearly, in this country and all developed countries that an engineer must study the ...
|
| NEUTRAL TO GROUND | 10/10/2006 |
Q: WHEN INSTALLING AN APLIANCE TO A 220 V SINGLE PHASE CIRCUIT IS IT OK TO BOND GROUND AND NEUTRAL ...
A: Didn't I just answer this earlier in the day? Got one just like it, maybe it was someone else. The ...
|
| Purpose of Neutral Conductor | 10/10/2006 |
Q: I have a portable generator that has a 240vac outlet. It has 4 conductors, 2 hot, a neutral and a ...
A: I will not answer this question without knowing the make and model of the generator AND your ...
|
| Future | 10/10/2006 |
Q: Actually my question is not about a problem that i have faced in working with an electrical ...
A: You face the same problem as most engineers - or any college graduate for that matter. Here is what ...
|
| earthing for electronic equipments and relays in EHV stations | 10/8/2006 |
Q: Is it safe to connect grounding of electronic equipments in aehv stn to connect to the earth mat ...
A: I need more information about the station and the environment. But, generally, an earth ground ...
|
| PCBs and ideal circuits | 10/7/2006 |
Q: i have studied some electronic circuits such as battery chargers in some electronic books, but when ...
A: Ah Ha, now you know what it is to be an expert! Only experience and deep understanding of the whys ...
|
| Signal Cable length | 10/6/2006 |
Q: What is the maximum signal cable length permissible for connecting the voltage signals in a process ...
A: The usual engineering approach is to limit the length to where the signal level at the terminating ...
|
| 2 dimensional array | 10/6/2006 |
Q: m zam . can u pliz do 1 guestion 4 me pliz , write a program that will read data from a file ...
A: Here is one example: http://aips2.nrao.edu/docs/reference/Coding/node7.html A problem example: ...
|
| 60 Hz environment versus 50 Hz environment. | 10/6/2006 |
Q: I am most impressed with your kind promptness & wisdom. I feel that you surely have 1st hand ...
A: Microwave is going to be okey at 50 Hz. Dish washer maybe okey. I would not run the washer on 50 ...
|
| wiring in an electric heater | 10/6/2006 |
Q: Ran a 220 off a 60 amp breaker going into a new electric heated using 10/2 romex. When I went to ...
A: I think this is a question for: http://allexperts.com/user.cgi?m=4&expID=19746&catID=1734 Please ...
|
| interfacing | 10/5/2006 |
Q: I want to learn hardware interfacing.I know C++ language only.I want to know how to program ...
A: That is a pretty broad question. There are so many interface applications. They are usually unique ...
|
| Current Limiting | 10/5/2006 |
Q: I am looking for a curcuit that will not exceed 20 amps with voltage being varible. The device I ...
A: A very simple way is the following: ONE: Put a small current sampling resistor in series with the ...
|
| PCBs and ideal circuits | 10/5/2006 |
Q: i have studied some electronic circuits such as battery chargers in some electronic books, but when ...
A: There are great differences between concept circuits that you would find in a text book or hobby ...
|
| Will 60 hz kitchen appliances work adequetly in a 50 hz environment? | 10/5/2006 |
Q: I am moving my family from Canada to Thailand. I wish to take my kitchen appliances, such as fridge, ...
A: Yes, Thailand is a 220v ac, 50Hz power source country. Small electronic appliances can be run using ...
|
| water heater element | 10/4/2006 |
Q: I understand that watts/volts=ohms Why does a brand new heating element rated for 4500 watts 220 ...
A: That is about right. As the heater element gets hot the resistance increases. The measurement ...
|
| Current Limiting | 10/4/2006 |
Q: What can I use to limit the Current on a 12 Volts system? I want to build something that will keep ...
A: Well, let me make sure I understand: You want to limit the current to 20 amps max? If you need to ...
|
| Tesla's oscillator | 10/1/2006 |
Q: Tesla revealed in 1935 that it was his oscillator that caused an earthquake in the area of his New ...
A: You have been reading too many consiracy stories. Maybe you read Ken Folletts book called Hammer of ...
|
| Sony Trinitron KV-20FV300 standby timer blinking | 9/30/2006 |
Q: I have a 2002 Sony Trinitron KV-20FV300 with no sound and no picture. When I turn it on the standby ...
A: This is a power supply problem and/or a resistor gone bad in the Jungle IC chip. Either of these ...
|
| power generation | 9/30/2006 |
Q: 1.why we can't generate the power from the running vechicle(bus,car),in that the can rotate so ...
A: 1. We do. The electric and hybrid cars do, indeed, have reverse braking; when the car braking ...
|
| hv testing of generator | 9/30/2006 |
Q: The answer i got does not fully correspond to my question i think i could not frame my question ...
A: Now I understand it completely. Yes, HV stress test is important for knowing the health of the ...
|
| Waveguides and transmission lines | 9/29/2006 |
Q: I hope this subject is appropriate to you. Please can you tell me what the difference is (if any) ...
A: The reason they seem overlapping is because they are! IT is often just a matter of convenience as ...
|
| hv testing of generator | 9/29/2006 |
Q: 1. how to determine/fix and specify the capacity of hv test equipment to be used to coduct dc hv ...
A: Not sure what the question is. Let me try to help. 1. If you are suspecting the stator windings ...
|
| Wat is Kirchoff's Law | 9/29/2006 |
Q: Can you explain Kirchoff's Law?
A: Kirchoff's law pertains to electric circuits. It says the sum of the voltage drops around a give ...
|
| electricity | 9/28/2006 |
Q: Does electricity travel thru a wire or around the wire? Is there a name for the electric wave? or ...
A: Current in a wire is from a charge which propels itself down the wire at nearly the speed of light, ...
|
| converting UK plug items to US plugs | 9/28/2006 |
Q: I am moving back to the States. While living in the UK I bought 8 lamps with UK plugs (floor and ...
A: http://www.beststuff.co.uk/voltage_conversion.htm The voltage is different in the two countries. ...
|
| ELECTRICAL EARTH PIT FOR HV TESTING LABORATORY UPTO 300 KV | 9/28/2006 |
Q: PLEASE INDICATE THE SPECIFICATION FOR EARTHING PIT FOR H.V. LABORATORY HAVING LOAD 3 PHASE 30 KW. ...
A: Earth conditions are important and depending on soil and structure of ground plane it will influence ...
|
| laplace transformer | 9/28/2006 |
Q: dir sir pleas help iwant slotion of laplace transformer f(t)= sin wt 1/2j(e-jwt-e+jwt) at end ...
A: I don't do homework, but here is a guide and list of transform operations that you can use to solve ...
|
| 3 phase 4wire delta output (high leg/wild leg) | 9/27/2006 |
Q: What is (was?) the most common use for the 208v to N ("B" leg) of a 240v (3 phase) / 120v (A to N) ...
A: Three phase is really intended for powering 3 phase apparatus such as motors and heavy machinery. ...
|
| 3 phase 4wire delta output (high leg/wild leg) | 9/27/2006 |
Q: What is (was?) the most common use for the 208v to N ("B" leg) of a 240v (3 phase) / 120v (A to N) ...
A: The phase angle of the three sine waves is 120 degrees. They are additive in the phase and yeild ...
|
| Science | 9/26/2006 |
Q: How does electricity travel thru a wire? Into our home?
A: Start here: http://science.howstuffworks.com/power.htm Then click on the links at the top of that ...
|
| motor running over-current | 9/24/2006 |
Q: Followup To Question - I have a 115/230v 1/2HP (wired for 230v) fan motor drawing almost twice ...
A: Look forward to your swap; sorry to put you to the task, but there is nothing more precise than to ...
|
| motor running over-current | 9/24/2006 |
Q: I have a 115/230v 1/2HP (wired for 230v) fan motor drawing almost twice it's rated current. I have ...
A: So, why don't you swap the motor from one of the other greenhouses that is running correctly and ...
|
| motor running over-current | 9/23/2006 |
Q: I have a 115/230v 1/2HP (wired for 230v) fan motor drawing almost twice it's rated current. I have ...
A: Since you are pulling almost twice the current as rated I wonder if you are not connected to the ...
|
| Jamicon Capacitor replacement | 9/20/2006 |
Q: I removed what looks like the bad cap from a very expensive PC power supply. It doesnt have a part ...
A: Yes, I can assure you it is an electrolytic power supply cap for filtering the hum ripple of the ...
|
| basic circuits | 9/19/2006 |
Q: how do i calculate the value of resistors needed in a circuit containing a LED and a transistor? ...
A: Assume the transistor has a gain of 100; so the current into the base of the transistor will be ...
|
| ceiling fan light wiring - seperate switches | 9/19/2006 |
Q: Light/fan combo. Ceiling light controlled by separate switches. Adding combo kit with separate ...
A: http://experts.about.com/q/Electrical-Wiring-Home-1734/index.htm Let me refer you to one of the ...
|
| Light Bulb Brightening | 9/19/2006 |
Q: What causes a shaken light bulb to "get brighter" just before it fails? (This seems to happen when a ...
A: There are two reasons for the bright flash as the bulb goes out: ONE: When the bulb experiences a ...
|
| transformers | 9/18/2006 |
Q: We have a delta / wye transformer voltage 600 primary 120/208 secondary 45 kva question ? with ...
A: What? Well, I can understand some current because with no load on the secondary you still have ...
|
| basic circuits | 9/18/2006 |
Q: how do i calculate the value of resistors needed in a circuit containing a LED and a transistor?
A: Using ohm's law you can calculate anything you need to know. Voltage = current X resistance If you ...
|
| How to select an appropriate Timer Delay? | 9/18/2006 |
Q: i want to select a timer delay to be used as a safeguard for a large AC Compressor when electricity ...
A: This is a matter for the manufacturer of the compressor. They know the motor characteristics and ...
|
| solar house electrical system probelm | 9/18/2006 |
Q: My house is "off the grid" and runs exclusively on solar power. The Energy charges a battery bank of ...
A: I am confused. Are you running the house on DC? Or do you mean the inverters convert to AC? Let me ...
|
| 3 phase basics | 9/18/2006 |
Q: Background: I have 3 phase power coming into my shop. I have a 30hp motor on a screw type air ...
A: Most North American service provide 120 and 240 voltage servcies; both in single phase and 3 phase. ...
|
| DC motor controller | 9/16/2006 |
Q: How do you supress the transient voltage of a 50 hp dc motor from comming back to your switching ...
A: Well, I know diodes work on small fractional and upto 10 HP, but a 50 HP motor is another matter. I ...
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| refrigrator | 9/15/2006 |
Q: please may i know how many watts does a refrigerator use in starting. please reply soon Answer - ...
A: Super General is a trading company out of Dubai and I cannot find any listing for this refrigerator. ...
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| 3 phase basics | 9/15/2006 |
Q: Background: I have 3 phase power coming into my shop. I have a 30hp motor on a screw type air ...
A: I think you may be measuring across two legs. You should get 120 from each leg to ground, but from ...
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| exciter circuit | 9/15/2006 |
Q: I want to design an auotmatic voltage regulator using thyristor for controlling desiel generator ...
A: I don't have the time and energy to design a circuit for you now and I can't find a site that gives ...
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| logic gate | 9/15/2006 |
Q: if the input of an inverter has broken and the circuit is open circuited, what is the inverter ...
A: One must know the cause of the "broken" and result. And one must know what kind of inverter you ...
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| refrigrator | 9/14/2006 |
Q: please may i know how many watts does a refrigerator use in starting. please reply soon
A: They are all different; depends on the size of the motor, the circuitry used, etc. At the ON cycle ...
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| LVDT | 9/14/2006 |
Q: Ypu have given the analog devices option but i have already search for AD598/698 but they r not ...
A: http://www.keckec.com/seismo/images/osc.gif Schematic above. Story at: ...
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| LVDT | 9/14/2006 |
Q: I am working on signal conditioning and processing of LVDT (using in feeback unit of servodrive).I ...
A: PS POST: Shucks, I forgot about my friends at Analog Devices. Check this website: ...
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| virtual ground circuits | 9/14/2006 |
Q: I see people use Resistor Divider to make a symmetric power supply. This is the netlist of simple ...
A: In resistor divider grounds they keep the resistor network low impedance because the currents in the ...
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| Electrical Cables | 9/14/2006 |
Q: 1. Will there be any impact as a result of over-tensioning electrical cables with cable ties. 2. ...
A: Unless their are very long runs (hundreds or thousands or feet) it makes no difference to the ...
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| How to Make a small light bulb blink | 9/13/2006 |
Q: I have a small light bulb hooked up to a 12V 500ma AC adapter. I would like the light bulb to blink ...
A: http://www.stanorrtrainparts.com/shopsite_sc/store/html/bulbs.html ...
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| How to Make a small light bulb blink | 9/13/2006 |
Q: I have a small light bulb hooked up to a 12V 500ma AC adapter. I would like the light bulb to blink ...
A: There are many solutions. ONE: Car signal light blinker (from car parts places) TWO: IC chips ...
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| generators | 9/12/2006 |
Q: ------------------------- First, thank you for replying yo my question. second, whats the use of ...
A: The exciter system is to power the field coils inside the generator such that when the rotor coils ...
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| generators | 9/11/2006 |
Q: i want to know how generators build up their voltage?
A: http://www.wvic.com/how-gen-works.htm ...
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| Electrical Adapters | 9/9/2006 |
Q: I have a Recreational Vehicle with 50 amp service. Using adapters, can I use the 15amp outlets in ...
A: I am not sure what you mean, but if you are wanting to put adapters back to back I do not recommend ...
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| 250 kw generators | 9/8/2006 |
Q: how much torque and how many rpms does it take to run one of those large windmill generators I ...
A: There are many designs; there are many engineering and technical aspects to consider. Is your ...
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| Transformer b-field | 9/7/2006 |
Q: if we put a coil of wire in a changing magnetic field the magnetic flux must cut the conductor to ...
A: It is very tightly coupled to the secondary which is co-wound with it on the core. The core acts to ...
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| nuteral loss | 9/6/2006 |
Q: Followup To Question - Hi, actually i liked your answers, i am asking about a thing that did not ...
A: WEll, one of the reasons why 3 phase is not used in residential and consumer applications is because ...
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| nuteral loss | 9/6/2006 |
Q: actually i liked your answers, i am asking about a thing that did not happen but imagine that if a ...
A: Oh, you are not in the USA? Sorry. In Europe, such as the UK and other countries that are on 220v ...
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| nuteral loss | 9/6/2006 |
Q: actually i liked your answers, i am asking about a thing that did not happen but imagine that if a ...
A: Homes are not wired for 3 phase; they are 220 with a tap in the middle for 110 and 110 that are ...
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| Electirc Thermos? | 9/4/2006 |
Q: i was just wondering how an electric thermos works, on how it's interior looks like when sectioned ...
A: http://www.monotsukuri.net/japan/mimamori/mimamori.htm The above site is tranlated from Japanese; ...
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| Sharp 32F361 | 9/2/2006 |
Q: The set abruptly turned itself off. When I went to turn it back on I noticed it was making a ...
A: I think it has lost the high voltage by virtue of the horizontal deflection amplifier gone bad. The ...
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| generators | 8/30/2006 |
Q: sir, I am a student of mechanical engineering. I am working on a project that involves production of ...
A: Hey, good project. Wish you well with it. You know, for this kind of project it may be wise to get ...
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| welder | 8/27/2006 |
Q: I have received a gift a few weeks ago, it is a welding machine, i think this is good, but what is ...
A: You will be much better of using a step down transformer of the right voltage and current rating. ...
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| DC generator output vs. armature speed | 8/24/2006 |
Q: This relates primarily to a DC generator in an antique car (1933 Dodge) but the topic is generic. I ...
A: I read your feedback. Thanks. Actually, I don't believe there is a votlage regulator in the 33 ...
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| air conditioning motors | 8/24/2006 |
Q: what affect would connecting 120 volts single phase to a motor rated at 240 volts single phase have ...
A: It would likely not be sufficient voltage to make it turn. The motor would stay in a stalled ...
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| kilowatt-hour consumption | 8/23/2006 |
Q: how do you compute for the kilowatt-hour consumption of an aircon unit given its horse power rating? ...
A: 1 horsepower = 745.699872 watt In aircons the hp rating is usually the rating of the motor driving ...
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| USB transmission line. | 8/20/2006 |
Q: One thing I have noticed about USB cables is that some of them have ferrite-beads (inductors) to ...
A: Ferrite beads are to balance the lines impedance for maximum delivery at the specified ...
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| about CBCT & Hall effect CT | 8/20/2006 |
Q: 1.What is Core balance current transformer.and what are all the types & usages. How Hall effect CTs ...
A: http://www.polycastinternational.com/ See these types above; there are many possible applications. ...
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| USB transmission line. | 8/18/2006 |
Q: USB cable is a shielded twisted pair and works as a transmission line with the signal propagating at ...
A: I failed to mention that the USB standard document uses 5 meters as a qualification length; that is, ...
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| engineering software | 8/15/2006 |
Q: i was looking to see if there is a good engineering software that you might know of that does a lot ...
A: http://www.securityideas.com/howtocalvold.html ...
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| HVAC CALCS | 8/11/2006 |
Q: I AM DOING A PROJECT WITH TWO OUTSIDE A/C UNITS AT 33 AMP EACH. THE TWO INSIDE FAN COILS ARE 4 AMPS ...
A: During the heating process the consumption will be 4 amps times the voltage times 2. If you are ...
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| DC Control relays | 8/10/2006 |
Q: I want to use a industrial 125 vdc control relay to control another relay and dc contactor for large ...
A: In my opinion 10k feet is not a long distance. If the relay to be operated is a normal type of ...
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| current to volt | 8/9/2006 |
Q: actually i have an idea of a resistor of 250 ohms, this will lead to have 5 volts when the current ...
A: Oh, you want a working unit; not just a laboratory assignment to complete! I will give you two ...
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| energy usage of household appliances | 8/9/2006 |
Q: My querry: Is there a formula for computing energy usage(watts), if given; ac Voltage, Hertz, and ...
A: Power in watts is equal to voltage times current. So, if the voltage is 120v ac and the unit draws ...
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| current to volt | 8/8/2006 |
Q: actually i have an idea of a resistor of 250 ohms, this will lead to have 5 volts when the current ...
A: Well, surely you know Ohm's Law. It states that current passing through a conductive resistance ...
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| science | 8/4/2006 |
Q: could thermoionic emission be a way of supply ing a space craft with electricity? is this possible ...
A: I really don't know the answer to your question (although I understand the question clearly) and ...
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| Electrical Panelboards | 8/1/2006 |
Q: What is the difference between a NEHB panel and a NQOD panel?
A: This document will explain the basics: ...
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| Wiring a ceiling fan | 8/1/2006 |
Q: I am installing a new ceiling fan and when I removed the old one and began installing the new one ...
A: All fans are different. But, you should follow the wiring diagram that comes with the unit. If ...
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| AC vs DC hz/Frequency | 7/30/2006 |
Q: I am considering buying a Ipod type clock radio that runs off a wall wart transformer to convert AC ...
A: Without the make and model I cannot give you a certain answer. However, most clock radios work off ...
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| Cable Earthing & personnel safety | 7/28/2006 |
Q: Sir, I f we have a long 11 KV Under ground cable section which is denergized . Now before I ...
A: If it is truly earth there would be no significant potential between the two earths. You can verify ...
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| Personnel safety | 7/28/2006 |
Q: Sir, I have just joined a power utility company and I have observed the following : When some ...
A: You can never be too careful when working around dangerous and potentially lethal voltages. A safey ...
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| Emitter Follower | 7/27/2006 |
Q: " The purpose of the resistor in the emitter leg is to swamp out the small voltage changes at the ...
A: Let's look at the emitter follower in two ways: DC for biasing the transistor up into its center ...
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| microwave oven damage | 7/26/2006 |
Q: My mother claims that she was heating water in her microwave and it caused the glass platter to melt ...
A: As explained earlier, the only way you can get that concentration of heat - an temperature rise - is ...
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| forwarded question - Serial-Wound AC motor | 7/25/2006 |
Q: Can you help me with this question on AC motors?.. Question originally posted to Dave Nyce who is ...
A: The rotational direction is designed into the location of the rotor and the coils. Direction cannot ...
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| Exterior remote heads | 7/25/2006 |
Q: When are exterior emergency remote heads required (for emergency egress lighting). My company uses ...
A: Yes, you are right about the matter of building codes and local requirements. Here is the thing: ...
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| Sounds effect on TVsets | 7/24/2006 |
Q: In the early 1970,s our child had a rubber squeaky toy. When he squeezed it near the TV it would ...
A: Well, for one thing, there were power switches that worked on those noises. Did you have one of ...
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| joules needed and how to calculate joules | 7/22/2006 |
Q: have a line resistance of .5 and have four ~1 ohm bridgewires in parallel. How joules of energy are ...
A: A joule is one amp/sec. So, you can work in the volts and amperes domain easier. Joules are not ...
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| Ceiling fan motor | 7/22/2006 |
Q: Our roof leaked, right into my wife's favorite ceiling fan, dripped on a circuit board and let all ...
A: Can't help without the make and model of the fan and the remote control system you purchased. It ...
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| control voltage 220V AC instead of 110VAC | 7/22/2006 |
Q: I would like to know one more thing .Air conditioner panel of railway coaches uses Step down ...
A: That is good; the step down to 220 from 415 volts will give economies in the transformer. I ...
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| dictionary | 7/20/2006 |
Q: I want to design a digital dictionary,I have a computer science background but know nothing of ...
A: This is no trivial project. First, you must decide many system requirements. Such as: How big ...
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| Small electric motors... | 7/19/2006 |
Q: Howdy! This may not be your exact field of expertise, but you might can answer it anyway. Why do so ...
A: It is a fair question and here is the answer: ONE: It is the straight connection that gives the ...
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| control voltage 220V AC instead of 110VAC | 7/19/2006 |
Q: Indian railways are using airconditioner panels in coaches with 110 volts ac contol supply since ...
A: Well, higher voltage operation allows for lower current levels for the same power consumption. ...
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| data transfering | 7/19/2006 |
Q: I want the answer of my following question. I have a Dos operating based industrial dedicated ...
A: At the bottom of this page http://www.intproducts.com/industrial.html you will find a FAT data ...
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| EMP | 7/18/2006 |
Q: Would an elctromagnetic pulse affect a 1967 Corvette Stingray in anyway? Would it still be ...
A: Depends entirely on the strength of the pulse and how it was pulsed. If from a distance, even though ...
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| Car CD Player | 7/16/2006 |
Q: I have a 2004 Chevy Cavalier stock CD player that isn't taking in cds. When I put a cd in I can ...
A: Yes, I would just replace it. The mechanism is probably okey; it is the controller IC module. ...
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| Electrical Engineering | 7/16/2006 |
Q: We are having differing opinions regarding the isolation of Armor & Shielding on Single conductor ...
A: It depends entirely upon the application. One Belden site had this to say (about 60 Hz isolation): ...
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| Finding a UPS for an LCD projector | 7/15/2006 |
Q: i hav recently purchased a SONY(VPL-EX3)LCD projector. It's power comsumption is 220Watts when ...
A: Are you afraid of power failures in your area? Yes, because of the heat generated by the backlight ...
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| dc generator | 7/14/2006 |
Q: IN THE ALTERNATOR IF THE ELECTRIC LOAD INCREASE THE SPEAD OF THE ALTENATOR WILL DECREASE BUT WHY IN ...
A: But running at constant speed is a construct of the explanation of the system. If the shaft is ...
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| lead-lag filer | 7/14/2006 |
Q: I am studying on PLL and I meet some difficult problems.In PLL, people usually use lead-lag filter. ...
A: Here is a really good discussion on how the lead-lag filter works and why it is necessary. ...
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| dc generator | 7/14/2006 |
Q: IN THE ALTERNATOR IF THE ELECTRIC LOAD INCREASE THE SPEAD OF THE ALTENATOR WILL DECREASE BUT WHY IN ...
A: Not so sure what you mean. See this http://www.tpub.com/content/doe/h1011v2/css/h1011v2_92.htm ...
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| help | 7/13/2006 |
Q: What i have is a cart pendulum like the one you can see in : ...
A: I suppose you will have to go down below the motion simulator on that web page and add another force ...
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| help | 7/12/2006 |
Q: I am trying to make a pendulum swing beginning from the downward position and resulting in the ...
A: Could you explain a little more? Are you doing a physical pendulum or a software pendulum? See ...
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| reactive power and voltage | 7/11/2006 |
Q: in electric power systems there is agreat relation between the voltage and the reactive power on the ...
A: Not sure I understand the question, but let me comment: In power systems the voltage and current ...
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| Voltage no Current | 7/11/2006 |
Q: I’m doing a school project where I’m using 2 small wind turbines which produce small AC power. The ...
A: Your problem is not voltage or current; it is power! The wind turbines are not kicking out enough ...
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| Voltage no Current | 7/11/2006 |
Q: I have 2 DC sources, both producing about 3 – 4 volts but I have very little to no current (none ...
A: 10 ohms is way too low; it will draw too much current for a light weight supply. If you could tell ...
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| single nano wire transistor | 7/11/2006 |
Q: i need information about single nano wire transistor thank you
A: Here is some background information I found; but I need to know more about your specific interest; ...
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| Emitter Follower | 7/10/2006 |
Q: Is the transistor in an emitter follower always in its active region unless the voltage on the base ...
A: Well, sort of. I think you are misunderstanding the operation of a transistor linear (class A ...
|
| three legged capacitor | 7/10/2006 |
Q: I am replacing old electrolytics in a vintage guitar amplifier, the problem is one that has three ...
A: This is just two caps in the same can. And, yes, electrolytics are polarized and the plus terminal ...
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| Constant current source | 7/9/2006 |
Q: I want to design a current source that will supply constant current around 10mA for load resistance ...
A: What! Do you realize that if you push 10ma through a 3Mohm resistor you must have 30,000 volts to ...
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| power cables | 7/8/2006 |
Q: I AM LOOKING AT BUYING A HOUSE WHICH IS IN A VILLAGE CALLED GUNTHORPE IN NORTH NORFOLK IN UK AND THE ...
A: There are many claims, primarily from pseudo scientists, who do claim dangers from being close to ...
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| C | 7/4/2006 |
Q: I am a student of B.E(electronis)& I am going to study C++ for microcontroller.I have just started ...
A: http://www.edcomp.com/search.aspx?t=0&q=c++&cmd=Search%21 ...
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| generator | 7/3/2006 |
Q: please tell me the basic difference btween a synchronous and a dc or ac generator
A: http://www.windpower.org/en/tour/wtrb/syncgen.htm The above shows how a wind generator works and ...
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| help | 6/28/2006 |
Q: I am studying electrical and computer engineering in a Greek university. My studies last 5 years, ...
A: You are thinking correctly to consider the course work and the working opportunities. But, you ...
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| Phase comparator | 6/28/2006 |
Q: May you explain the phase comparison of two signals.Sir actually i am using 2.5kHz of frequency for ...
A: From the Data Sheet: General Description The MM74C932/MM54C932 consists of two independent output ...
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| Electrical Resistance Tomography | 6/25/2006 |
Q: I would like to know about electrochemical principle that apply in Electrical Resistance ...
A: Maybe these images will give you some ideas of the current distribution within the electrolyte. ...
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| Phase comparator | 6/25/2006 |
Q: I want to compare the phase of two ac signals i-e whether they are in phase or out of phase.The ...
A: Phase comparison can be done by viewing them on an oscilliscope screen; but you want an output that ...
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| Power Supplies | 6/22/2006 |
Q: I have a hand held game that requires 5 volts and a power supply that states 5.5 volts. Will using ...
A: Probably not, but you must know about the current capacities and the regulation qualities of the ...
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| Oscillator | 6/22/2006 |
Q: Someone say that LC oscillator is 'low phase noise'. I don't known about that. Can you explain for ...
A: Phase noise is usually because the Q of the circuit is low - and has a high bandpass for the noise. ...
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| simple to construct Voice Over SMB -- ASK | 6/18/2006 |
Q: I am trying make voice over either ELF or VLF frequency band , I saw some info reguarding vocoder ...
A: Here is an interesting discussion: ...
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| reg.....transformers | 6/16/2006 |
Q: sir... can u please explain about transformer bus coupler. and please recommend me some sites which ...
A: https://www.abb.com/global/abbzh/abbzh251.nsf!OpenDatabase&db=/global/seitp/seitp328.nsf&v=9AAC72000 ...
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| reg.......transformers | 6/16/2006 |
Q: ...i was very much satisfied for ur answer of my last question..... i would like to know.."why ...
A: Transformers can be connected in series, parallel or any way necessary to fullfil their intended ...
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| reg..capacitors | 6/15/2006 |
Q: ...this is sunil plz explain me "why capacitors are used in starters of incandescent lamps"
A: Incandescent lamps do not require starters; they are resistive in nature. Perhaps you are thinking ...
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| cmos technology | 6/13/2006 |
Q: I see many people say '0.5 um technology, 0.18um technology ...'I don't understand What it mean. Do ...
A: This is the spacing between the circuit paths; hence it has a great deal to do with how dense the ...
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| Waveguide Tuning Stubs | 6/4/2006 |
Q: I guess in the test that I am taking and the multiply choice answers that they are giving are just ...
A: A waveguide is not a 2 wire transmission line; rather it is a square/rectangular tube that the em ...
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| Waveguide Tuning Stubs | 6/4/2006 |
Q: What is the electrical equivalents of the E-plane waveguide tuning stub and the H-plane waveguide ...
A: Think of them as a termination, much as a termination on the end of a transmission line. The tuning ...
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| 12 volt LED | 5/29/2006 |
Q: I am trying to install 12 LED taillights in my motorcoach. But the coach is 24 volt. I believe the ...
A: If you use a dropping resistor it will dissipate much valuable heat and place a serious load on the ...
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| Triac controlling Electric Motor | 5/23/2006 |
Q: So for a motor, reducing the voltage across it does not increase current through it? So as long as ...
A: Reducing the voltage will decrease the current as long as it is running. But, when it reaches the ...
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| Triac controlling Electric Motor | 5/23/2006 |
Q: If you ran a 240V rated motor on 120V the motor would turn to slowly for a substantial couter-emf to ...
A: As a general answer you can reduce the power input (voltage in the case of most motors) to a certain ...
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| degital desplay | 5/19/2006 |
Q: I have 0Vdc to 5Vdc analog signal.I want to see it on 7-segment desply in such away that when input ...
A: You will need an analog to digital converter with 8 bit resolution. See ...
|
| using infrared beam to monitor fish movement... | 5/11/2006 |
Q: my name is Andy, an undergrad at UVA. I am doing research on circadian rhythms of puffer fish and ...
A: Great idea. Yes, the beam should be able to penetrate the water so long as there are no abberations ...
|
| Turntable Pickup/Stylus | 5/5/2006 |
Q: In terms of theory is there any difference between MM and MC pickups (apart from one moves the ...
A: MC output is very low and needs a special preamp, usually. The sound quality from MC is very good. ...
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| fm transmitter | 4/28/2006 |
Q: i am an electronics engineering student trying to design a 300W fm transmitter.The major problem i ...
A: http://www.broadcastwarehouse.com/p/BW/FM-Transmitters/TX150/300-Stereo-FM-Transmitter?pid=4 Is a ...
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| Voltage Limit on Series Wound DC Motors | 4/27/2006 |
Q: We are a lead-acid battery distributor dealing with batteries that supply power to underground ...
A: The extra battery cells mean more power as well as higher voltage; therefore, it is driving the ...
|
| Analog Signal Processing | 4/23/2006 |
Q: and thanks a lot for offering to offer your expertise to people like me. Currently, I'm using a ...
A: Chris, Not sure I understand what you are doing and what alternate strategies may be sensible. ...
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| 7-segment | 4/3/2006 |
Q: I want to know how can a point be moved on 7-segment display when using 7447 decoder. For ...
A: Here is one example: http://www.electronics-lab.com/projects/test/014/index.html Here is another: ...
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| elctrical engineeering | 4/1/2006 |
Q: Based on the diagram, comments about the a) 1 phase and 3 phase conection and wiring b) energy ...
A: What? I received the DWG drawings in my email box. I looked through the 20 some odd diagrams and ...
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| signature analyzer | 3/27/2006 |
Q: ------------------------- Dear sir, I want signature analyzer for signal analysis.I am ...
A: http://goethe.ira.uka.de/~goerke/shiftreg/Signature-analysis.html ...
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| signature analyzer | 3/27/2006 |
Q: I want some tutorial links about signature analyzer.I could not find it anywhere on net. so plz help ...
A: http://www.topazsystems.com/links/wpforensicbiometric.htm http://www.securityfocus.com/infocus/1663 ...
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| Delta-Wye transformer | 3/18/2006 |
Q: I hope you don't mind furthur clarifying a point: I think the problem is I am unfamiliar with the ...
A: A transformer is, in the ideal, transparent to the ac system. For example, a load on the secondary ...
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| Delta-Wye transformer | 3/17/2006 |
Q: I just want to clarify one point: How can a ground reference go through a transformer? I thought ...
A: Don't confuse ac and dc conditions. A dc ground (hardwire ground) cannot pass through a transformer ...
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| Delta-Wye transformer | 3/17/2006 |
Q: The reason we ground a power grid instead of leaving it floating is to make the earth a point of OV ...
A: Here is a good discussion on the various distribution configurations for electric power: ...
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| Photoelectric emission | 3/14/2006 |
Q: I didn't have any photographs of the experiment but I did find a video on the web that is almost ...
A: Electroscope experiements are very tenuous because of the very low current levels. The electrons ...
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| Photoelectric emission | 3/13/2006 |
Q: I tried the photoelectric experiment with the negativly charged electroscope and found that the ...
A: I cannot give you a viable comment because I don't know the details of the electroscope and the ...
|
| tank circuit | 3/8/2006 |
Q: I have an LC circuit that I wired into a CMOS inverter circuit in place of where you would normally ...
A: You may need to add a tuned circuit or low pass filter at the output to keep it from bouncing up. ...
|
| Photoelectric emission | 3/7/2006 |
Q: If I took a negativily charged oscilloscope and shone a light on it (UV light-above threshold ...
A: A. There are many types of electroscopes. Please see these I have chosen for your consideration. ...
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| Capacitor and Antenna | 3/3/2006 |
Q: The equation for energy gained in an electric field is: E=QV But the equation for energy stored in ...
A: Energy in a Capacitor: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/capeng.html Energy in ...
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| Sidebands and Antenna | 2/21/2006 |
Q: so the website (http://electronics.howstuffworks.com/question230.htm) is wrong? A transmitter only ...
A: YOU ARE WELCOME. MY REPLY IS IN CAPS. so the website ...
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| Sidebands and Antenna | 2/19/2006 |
Q: This article talks about the buzzing effect a cell phone has on active computer speakers: ...
A: ONE: Buzz into audio amp is usually due to a strong enough signal at the junction of a first ...
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| electrical project | 2/16/2006 |
Q: i am a 400L student of electrical engineering majoring in electronics and telecommunications.can you ...
A: http://my.integritynet.com.au/purdic/ http://www.web-ee.com/ ...
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| COMPACT DISCS | 2/15/2006 |
Q: sorry but would u plz explain'rare earth properties'again?what is a laser beam actually?how can it ...
A: Rare earth materials are those that are formulated and used for applying to the surface of ...
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| antennas | 2/11/2006 |
Q: i would like to know how an antenna works?how does its material contribute?
A: Answer: In its simple form it is merely a catcher of electromagnetic waves that were sent by a ...
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| MICROPHONES | 2/10/2006 |
Q: HOW IS IT POSSIBLE THAT IF A MICROPHONE IS PLACED AT A PLACE IT ENABLES OTHER PERSONS TO HEAR VOICES ...
A: ANSWER: Hi, again. Well, a microphone is merely a very small acoustic transducer. It has a ...
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| CD | 2/10/2006 |
Q: what is the substance on a CD that records things?also how does a CD work?
A: ANSWER: Wow; you really want a full engineering course in digital audio, optical recording and ...
|
| LDR Switch | 2/6/2006 |
Q: I have a very simple circuit question, but it's a few years since I did electronics in school, so ...
A: ANSWER: 1. Well, the circuit you refer to in the URL is just a concept schematic. You must select ...
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| Dielectric Constant | 2/4/2006 |
Q: The part I don't get is that from the website you suggested, and an article on dielectric constant ...
A: ANSWER: From: http://www.allaboutcircuits.com/vol_1/chpt_13/3.html I quote: DIELECTRIC MATERIAL: ...
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| Dielectric Constant | 2/3/2006 |
Q: I have read that the dielectric constant of a material is its ability to pass an electric field ...
A: Simon, Wrong concept. http://scienceworld.wolfram.com/physics/DielectricConstant.html This is a ...
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| Replace VCR cord | 1/29/2006 |
Q: I mistakenly cut a cord that goes from my VCR to my televison, can I replace it. It is a two ...
A: Well, I can't know which cable you are speaking of; could be the rf out, composite video or audio ...
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| I / V convertor | 1/25/2006 |
Q: I want a circuit for i/v convertor.I know opamp as I/V convertor but it is for low current.I have 0 ...
A: Are you measuring ac or dc currents? Is it a high impedance or low impedance circuit? If it is a ...
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| science project | 12/31/2005 |
Q: I am having a really hard time finding any information on a science project question I have. My ...
A: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/capchg.html The above site will show the ...
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| Internal Resistance | 12/21/2005 |
Q: If you had a normal cell connected to a 1-Megaohm resistor, measured the current through the ...
A: You sent this question to one of my collegues. You did not like the answer? I think you are ...
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| CRT final anode | 12/9/2005 |
Q: "an aluminum overcoat is deposited over the phosphor/black matrix. This has several functions: * ...
A: There is 25,000 volts on a typical tv crt. That is enough voltage to attract dust from all over the ...
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| CRT final anode | 12/7/2005 |
Q: Just to check: The final anode consists of the aquadag coating around the "bell" of the tube but is ...
A: Not sure I understand your question. Take a look at this slide presentation: ...
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| design between tow generators | 11/17/2005 |
Q: der sir, kindly i'm asking if i have tow generators(1MW)and if i need the first generator working ...
A: Caterpillar, Cummins and Genarac are the big makers of switch gear for medium sized generators. I ...
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| Earth and static electricity | 11/12/2005 |
Q: ) Once, I got a shock from a whiteboard... I look at it like this: when wiping the whiteboard some ...
A: You are confusing current flow and closed circuit paths with the concept of just moving charges ...
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| Earth and static electricity | 11/11/2005 |
Q: I believe this point to be true: IN THEORY: if you took the -ve terminal of a cell and bueried it in ...
A: ONE: Current flow, as from a circuit connected to a battery, is actual movement of current (in ...
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| amplifier squelch circuit | 11/10/2005 |
Q: What is the disadvantage of a squelch circuit.
A: Nothing, really. Think of the squelch function as an automatic mute with some predetermined level ...
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| Electron Migration | 10/22/2005 |
Q: When a PN diode is forward biased the electrons in the n-type and the holes in the p-type combine ...
A: A metal contains only delocalised electrons so how can there be any holes? IN A PN JUNCTION THERE ...
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| Power Ground | 10/19/2005 |
Q: So, in a power grid, the ground is only ever used as a reference for 0V/ a protective current path? ...
A: Delta connections are always 3 phase. WYE connections have a ground at the center. Delta ...
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| Power Ground | 10/17/2005 |
Q: This link: http://science.howstuffworks.com/electricity8.htm shows a transformer drum with a ground ...
A: It is not a "drum" - it is a transformer mounted in its housing. (And, yes, I know howstuffworks ...
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| transformer back emf | 10/10/2005 |
Q: When you switch off a transformer does it deliver a voltage surge to the appliance? How does the ...
A: http://www.cwi.nl/research/2001/Ebert_Eng/ http://www.yurope.com/org/tesla/6e.htm ...
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| MODULATION | 10/6/2005 |
Q: 100% SINUSOIDAL MODULATION PRODUCES AN ANTENNA CURRENT INCREASE OF? 2.25% 22.5% 37.5% 3.75% 50% I ...
A: When in AM modulation the modulated signal consists of the carrier and two sidebands of fc + fm and ...
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| Capacitive Touchpad | 9/7/2005 |
Q: A capacitive touchpad works by forming a capacitor with your finger as it has a wire mesh grid under ...
A: The body has lots of liquid. The pad is not seeing only the surface of the skin but the charging ...
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| simple illumination principle | 8/30/2005 |
Q: does a 40 watt fluorescent lamp give more lumen output than a 20 watt fluorescent having same brand? ...
A: There are lighting standards by which manufacturers test and rate their products. Candlepower or ...
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| Applications for Equalization | 8/23/2005 |
Q: When an audio signal that has been recorded on a magnetic tape is played back the higher frequency ...
A: In a vcr the audio head is the same as an audio player and the equalization in the playback preamp ...
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| inductor and transformer | 8/9/2005 |
Q: As the inductor's back emf is larger than the "supply" voltage I would expect that in an LC ...
A: No, it doesn't work like that. When the cap is placed across the inductor the cap has no charge ...
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| inductor and transformer | 8/8/2005 |
Q: If you charge up an inductor with a 9V battery until it is magnetized and then remove the battery ...
A: The back emf is a functon of the inductance of the coil when it goes open circuit. The voltage can ...
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| DC generator | 7/8/2005 |
Q: I have a question about dc generators. On a dc generator, this one in particular is on a engine for ...
A: SSG Deer, You are right on both accounts! Because it depends on how the generator is wired by the ...
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| generating light | 7/4/2005 |
Q: In an incandescent lamp electrons are stepped up to a higher orbital then as they fall down, photons ...
A: I think you have over complicated the heat light. It is simple a resistor that heats up with ...
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| electronics and instrumentation or electronics and communication | 6/24/2005 |
Q: i have currently passed and am pondering over which is a better field among e&i and ece.please give ...
A: This will come from you personal interests. Where do you want to live? Do you want a big city or a ...
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| electronics and instrumentation or electronics and communication | 6/23/2005 |
Q: i have currently passed and am pondering over which is a better field among e&i and ece.please give ...
A: ECE is the more growth oriented career now days. But, you should make your decision on which is ...
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| Career: electronics/electrical engineering | 6/19/2005 |
Q: Generally, what is the difference between studying electronics and electrical engineering at ...
A: Q: Generally, what is the difference between studying electronics and electrical engineering at ...
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| ELD +TV color | 6/13/2005 |
Q: The transformer is called a 1:100 transformer, but does this mean it actually has 1 primary turn to ...
A: 1:100 is the ratio; there may be 10 primary and 1,000 secondary; depends on the necessary electrical ...
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| ELD | 6/8/2005 |
Q: An Electroluminescent Display need a high AC voltage to operate. A EL backlit watch only has a 3V ...
A: http://science.howstuffworks.com/question296.htm Will explain much. Yes, a small transformer is ...
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| Equalizers and pickups and volume control | 5/31/2005 |
Q: I know that if you use a magnetic reader/pickup (in a tape deck or a turntable) the pickup will ...
A: Simon, Actually, the piezo pickup is a constant velocity device which will give an output that is ...
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| I WAS WONDERING HOW MANY DEGREES... | 5/29/2005 |
Q: I WAS WONDERING HOW MANY DEGREES A PHASOR ROTATES WHEN MULTIPLIED BY j AND WOULD IT BE EXPRESSED IN ...
A: Claudia, j is a math operator. In electrical circuits it is 90 degrees. Impedance, for example is ...
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| fringe howl | 5/25/2005 |
Q: ITS ME AGAIN SO IF YOU CUT OFF FEEDBACK BY TUNING OFF FREQUENCY WOULD THAT CAUSE IT TO GO OFF ...
A: No, usually the going off tune is done manually by the operator; in other words it is caused by not ...
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| fringe howl | 5/25/2005 |
Q: IS THE STARTING AND STOPPING, AT AN AUDIO RATE OF SELF OSCILLATIONS CONTRIBUTE TO THE PRODUCTION OF ...
A: Claudia, Wow, there aren't very many people still alive that even know what fringe howl is! It is ...
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| Generator Torque | 5/17/2005 |
Q: ! Ok.. is this right?: If you have a 115V generator and connect a lamp to it you will get 115V ...
A: My reply in CAPS TO YOUR QUESTIONS. If you have a 115V generator and connect a lamp to it you will ...
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| Generator Torque | 5/16/2005 |
Q: A generator becomes harder to turn the "heavier" the load attached to it is (I suppose it would ...
A: Simon, Yes, you are correct; the generator is merely a converter. It converts mechanical energy ...
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| Wana know abt IP PHONES | 5/14/2005 |
Q: Helo sir How r u & i hope that u will be fine, Sir I wana to know abt the IP phones , their woking ...
A: Hafeez: Go to this web site: http://computer.howstuffworks.com/ip-telephony.htm You will find ...
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| Bias-Rg | 5/5/2005 |
Q: This webpage talks about cathode bias: http://www.tpub.com/content/neets/14178/css/14178_43.htm But ...
A: Simon, It is much less sinister. The purpose is to have a shunt path for electron build up on the ...
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| thevenin's theorem | 4/30/2005 |
Q: we have a circuit in which only a current dependent source is working.No other source is present in ...
A: Abid, In a Thevenins equivelant circuit, the source can be either a current generator or a voltage ...
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| Screened cable and bass response | 4/28/2005 |
Q: Can I just ask why the bass response DECREASES as the value of the coupling capacitor gets lower? I ...
A: No, the impedance of a capacitor is inversely proportional the to the frequency. The equation for ...
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| Screened cable and bass response | 4/27/2005 |
Q: On my valve turntable I changed the screened cable that connected the bass pot to the PCB for ...
A: Simon, I am having a difficult time following your description of the symptoms. So, let me ...
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| Hum | 4/24/2005 |
Q: -). The record player is working!!! The record player always had a background hum in it, it would ...
A: Simon, Hum, Hmmmmmmm. Well, hum is on thing and power supply hum is another. The big can is in ...
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| Old resistor replacement | 4/22/2005 |
Q: I found out that the resistors are actually capacitors, but they read the same as resistors, except ...
A: This is the best color code directory for caps that is around: ...
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| Old resistor replacement | 4/19/2005 |
Q: I need to replace some old resistors from a valve amp. They are very small/hollow.. I read them to ...
A: Simon: Go to this web site to find the resistance and tolerance of the resistors you asked about. ...
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| Reduce power | 4/16/2005 |
Q: My application is simple, or simply just an idea of mine. I use Laptop to do my daily work, the ...
A: I cannot recommend that you design a replacement power pak for a laptop computer. The reason is ...
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| Reduce power | 4/15/2005 |
Q: nice to meet you. Here myI would like to reduce High AC power to Low DC power, the normal method is ...
A: Sani, It depends so much on the application. For example, if the power or current requirement is ...
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| NPN Transistor | 4/11/2005 |
Q: Just to clarify a few points on transistor operation: 1)If i connected the collector of the ...
A: Simon, You have a misconception about how the transistor operates. You should think of it as a ...
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| Oscillators | 4/11/2005 |
Q: and thanks for the quick response. It is very important for me to emphasize that this is NOT ...
A: 1. How can it be that the response oscillates at a frequency that doesn't exist in the circuit ...
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| Oscillators | 4/11/2005 |
Q: I am a student of electrica engineering. We have been asked in an Electronics Laboratry Class to ...
A: Congratulations. What is the question. Looks like a simple LC tuned oscillator circuit. The ...
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| Valve amplifier parts | 4/6/2005 |
Q: I am repairing (or attempting to repair) a 1962 Vacuum Tube amplifier.... and have a few problems ...
A: Easy Solution: 1) Put two of the .22uf in parallel. That will give you .44uf. That would be ...
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| what is major difference between PENTIUM & CELERON Computers | 3/26/2005 |
Q: RESPECTED SIR I wana to ask u that how much CACHE MEMORY MODERN COMPUTERS Intel PENTIUM ...
A: A really good site for questions like this is www.howstuffworks.com. If you dig into this site ...
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| 8086/8088 difference b/w mov and jump | 3/26/2005 |
Q: Respected Sir i wana to ask u that when we use that while dealing with the INSTRUCTIONS OF ...
A: I don't know the answer to your question just now. I have not programmed these processors for long, ...
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| how can i bright in electrical field | 3/24/2005 |
Q: Sir, my name is priya from India. im doing my engg. NIT jaipur. im in now 2nd year electrical engg. ...
A: There are so many fields in electrical engineering. Here is what I suggest you do. It will be a ...
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| electromagnetic wave propogation | 3/23/2005 |
Q: When you do the calculations on radio waves in the atmosphere, low frequency waves are less ...
A: Good questions. If you will go to the web site below and read it from beginning to end it will ...
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| A?D converters | 3/21/2005 |
Q: HOW R U SIR. I WANA TO ASK U THAT WHAT IS MEANT BY DUAL SLOPE ANALOG TO DIGITAL CONVERTER AND HOW WE ...
A: http://www.allaboutcircuits.com/vol_4/chpt_13/8.html Take a look at the site above. It will explain ...
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| AC bias | 3/15/2005 |
Q: So, a device like a transformer mixes together signals (adds frequencies and amplitudes) is used to ...
A: The heterodyning principle is a form of modulation. The purpose of this is to produce a constant ...
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| AC bias | 3/12/2005 |
Q: Is adding ac bias to an audio signal amplitude modulation? (the same as am for radios). One of the ...
A: You can amplitude modulate with any two frequencies. (And FM also, by the way). In radio there are ...
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| potential transformer | 3/11/2005 |
Q: ------------------------- Hello CLeggsan: Thanks once again for the answer. But now I am looking ...
A: You are looking at it backwards. The motor does not control the power; it consumes power. For ...
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| potential transformer | 3/11/2005 |
Q: ------------------------- Hello: Can you give me an answer how a motor draws power from a ...
A: The transformer is merely a transformer of the voltage and current ratios. Consider, for example, a ...
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| 8086/8088 microprocessor | 3/11/2005 |
Q: "Sir I wana to ask tke following quest. what are ascii instructions for 8088/8086 microprocessor ...
A: There are so many downloads on the internet that you can catch. Please do a google search for the ...
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| Mains Voltages | 3/8/2005 |
Q: I read this: " there are THREE wires coming into the house (and that's not counting the ground ...
A: This is three phase voltage system at work. It is used througout the world. The voltages and ...
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| elements | 3/6/2005 |
Q: I have noticed that when a lightbulb blows circuit breakers tend to trip and when elements in ...
A: Maybe your observations are different from mine. I have found light bulbs (incadescent varity) fail ...
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| generator exciter | 3/6/2005 |
Q: Sir, can you tell me what current does exciter produce, is it AC or DC to create magnetic flux? What ...
A: I don't understand this question. There are two kinds of exciters related to diesel engines. ONE: ...
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| PC consumption | 3/3/2005 |
Q: sir cleggsan... im christian.. sir, i leave in a certain boarding house where the owner ask an ...
A: Only way to determine power consumption is to measure it. The ratings and markings on the equipment ...
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| radio wave reciver | 2/22/2005 |
Q: my son is doing a science fair project for fifth grade. It is a short wave radio receiver. What I ...
A: Kathy, Shortwave radio broadcasts are just like all the others you have ever heard. They may be ...
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| IF strip | 2/19/2005 |
Q: I know that an IF strip is used with a capacitor to tune the frequency of the circuit, to allow a ...
A: No, you have it wrong. The IF (Intermediate Frequency) amp is a high gain, narrow band amplifier ...
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| potential transformer | 2/19/2005 |
Q: I see transformers in the sense of the law of conservation, energy cannot be detroyed or created. If ...
A: No, not at all. Power = voltage times current Power = current squared times resistance So, power ...
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| Transformers/ | 2/9/2005 |
Q: Just a couple of quick(ish?) points..... A transformer controls voltage by a ratio of turns but how ...
A: Let's take the first question about current in the transformer. Assume an ideal and perfect ...
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| Transformers/ Gain control | 2/7/2005 |
Q: Firstly, I know that the voltage output of a transformer depends on the ratio of primary and ...
A: TRANSFORMER DESIGN: The number of turns in a transformer has to do with the efficiency with which ...
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| 555 monostable/astable pin 5 connection | 2/4/2005 |
Q: Pin 5 of an IC 555 timer is labelled 'Control Voltage'. What purpose does this pin serve? I have ...
A: See, http://www.ee.iitb.ac.in/~teesa/presentations%20lectures%20workshops/electrified/480_555.htm ...
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| Sensors??? | 2/2/2005 |
Q: Sir how r u. Thnx FOR UR SO KIND SERVICE ON NET FOR PEOPLE. I AM ELECTRONICS ENGINEERING STUDENT. I ...
A: Good idea. You probably should use an rfid chip. They are cheap, made by ti and can work with just ...
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| Piezoelectric Effect | 1/31/2005 |
Q: When a continuous pulling or compressing force is applied to a quartz crystal, a potential ...
A: Piezoelectric devices are electrorestrictive; that is, they produce a voltage when squeezed - AND ...
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| Static Electricity | 1/31/2005 |
Q: I am in 7th grade and am trying to do a project with static electricity. I wish to know a few safety ...
A: This is not an easy thing to do. The reason is how to measure the amount of charge that is being ...
|
| CD Burner | 1/25/2005 |
Q: I read this website on 'How CD Burners Work' and it said that a CD burner has 3 lasers... a read ...
A: http://computer.howstuffworks.com/cd-burner.htm/printable The above site will explain with pictures ...
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| Duplex Coil | 1/21/2005 |
Q: In a telephone there is a duplex coil to stop the sound from the microphone being heard in the ...
A: Actually, you have it wrong. The duplex you are speaking of is to allow the conversation to take ...
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| circuit board design | 1/15/2005 |
Q: The application is for voice with no security concerns. A major parameter is the cost of the ...
A: Yes, getting an inexpensive receiver with a fixed frequency rather than the tunable one is easy to ...
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| Transformers | 1/14/2005 |
Q: I have a couple of electrical question pertaining to electronic music. I have a Peavey XRD680 plus ...
A: Some Peavy products have mult-taps on the power transformer. Converting them consists only of moving ...
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| Difference b/w 8086 & 8088 | 1/14/2005 |
Q: ------------------------- Sir THNX For ur answer but the LINK U provided is not woking . how ever ...
A: Try this site (The first one works, but it requires some special software to view it, I think): ...
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| Difference b/w 8086 & 8088 | 1/13/2005 |
Q: Sir I want To ask You That in the begining 8086 Intel microprocessor came and it was 16-bit but when ...
A: Hafeez: There is a niced ppt presentation on these isssues at: www.cse.wustl.edu/~bayazit/ ...
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| circuit board design | 1/12/2005 |
Q: I'm interested in having a radio reciever designed that operates in a frequency that is unable to be ...
A: It is always easiest, in situations like this, where you are looking for a one-only application, to ...
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| Series circuit | 1/8/2005 |
Q: I did a practical experiment in my school. The experiment was to make a series circuit with three ...
A: Aha, you have made an intersting, but common mistake. You are assuming the resistance remains ...
|
| Theremin | 1/5/2005 |
Q: A theremin is controlled by you moving you hands further towards or away from an antenna. I read ...
A: Your email came, but there was no schematic diagram. HOWEVER: this is an easy matter. The musical ...
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| AC/DC adapter | 1/4/2005 |
Q: I have already purchased rechargable batteries and a separate charger. Why I am trying to do is you ...
A: Yes, I understand completely. But I caution you to be careful. You don't want to destroy the ...
|
| AC/DC adapter | 1/4/2005 |
Q: It is a DXG-301V Video Camera. I have tons of Adapters. One is universal but the connectors don't ...
A: Here's the deal: DXG lists this unit as available with an adapter but none of the merchants around ...
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| bnc/alligator clip connectors | 1/3/2005 |
Q: I work in the QC lab at a ferrite plant. We use a temperature chamber to test the cores at different ...
A: Yes, but it is probably neglibible. It really depends on the frequency of the testing signal, the ...
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| AC/DC adapter | 1/3/2005 |
Q: I bought a digital video camera. It have a place for an optional ac/dc/ adapter that did not come ...
A: Debra, My daughter is just a girl; but she graduated from college in technology and taught at a ...
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| LCD types | 12/23/2004 |
Q: I know how a field-effect LCD display works. And I know that in order for it to operate, it need an ...
A: http://electronics.howstuffworks.com/lcd.htm/printable Above is a good site for basic operation of ...
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| DSP Questions | 12/19/2004 |
Q: I have the following questions that I am stuck on. Could you please help in solving them or at least ...
A: A good discussion of DFT solutions and strategies as referred to in the book described in ...
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| Speaker | 12/15/2004 |
Q: I have always assumed that the speaker on a cell phone was a small electromagnetic loudspeaker, but ...
A: Simon, Well, most phones do use a electromagnetic direct radiator for speaker, just the same as a ...
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| Information on the invention of the telephone. | 12/15/2004 |
Q: I need a lot of information on the invention of the telephone and how it works.
A: Mevlida, There is plenty written on this. It is one of the most famous episodes in the world of ...
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| memory | 12/5/2004 |
Q: Long time never talk to you. This time after exam, I would like to study a bit about meory. Thanks ...
A: Word size has to do with the digital computational structure; but it is nice to have a word size the ...
|
| Polarization in electromagnetic fields | 12/4/2004 |
Q: what is polarization? Discuss the practical importance to engineers of knowledge about, or ...
A: Moses, Well, the most obvious to students, is in high frequency broadcasting where microwaves are ...
|
| Anodes in CRT | 11/19/2004 |
Q: ¬) I think this question might be a bit vague.... Well, in a crt you've got the cathode at a ...
A: First, the cathode is not necessarily at a negative potential. It is, rather hot from the filament ...
|
| Information about "Music Taxi" | 11/11/2004 |
Q: Cleggsan, If you are familiar with a device known as "Music Taxi", I would like some feedback. The ...
A: Bob Orban is the creator of these gadgets. You might want to contact him or his company directly as ...
|
| ESD | 11/7/2004 |
Q: How are you. I need your help again Kindly look at page ...
A: Nice site. Nice circuits. Figure 3 works for me. Don't see any problem with it. When positive ...
|
| How to determine Voltage Fluctuation | 11/6/2004 |
Q: And a real fast response too! I am new to engineering in general, so I must ask you to clarify just ...
A: A peak detector will detect only all positive peaks or all negative peaks, depending on which way it ...
|
| Inductor | 11/5/2004 |
| Q: More info on how an inductor builds up a magnetic field on AC would be great! From |
