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About Dave Nyce
Expertise
I have been an electronics engineer for 25 years. I can answer questions on analog and digital circuits and my specialty is sensors.

Experience
I am the inventor on 23 US patents, and also some foreign ones. Developed sensors for over 25 years. Licensed private pilot (airplane and rotorcraft), have HAM radio license. I'm not an expert in computer networking.

You are here: Experts > Computing/Technology > Job Searching: Technical > Electrical Engineering > Finding equivalent resistance

Electrical Engineering - Finding equivalent resistance

Expert: Dave Nyce - 10/5/2003

Question
How do I find the equivalent resistance in this circuit? /\/\/ is a resistor and --- is a wire. All numbers are in ohms.

             40
|-----------/\/\/-----------|
|        5                   |
|------/\/\/----------------|
|             |             |
|             >             >
|        25 <               < 60
|             >             >
|             |              |
-----------------/\/\/------|
                 20

For some reason I'm having a hard time figuring out which resistors are in parallel with one another and which aren't. Thank you very much for any help you can give me.

Answer
I'm not sure that everything lined up right as I received it, but I think I have it. Assuming that you want the resistance as measured across the 40 ohm resistor:

the 60 and 20 ohms=80 ohms in parallel with 5 and 40. the 25 is also in parallel. So the total is a parallel connection of 40, 5, 80, and 25 ohms. This comes out to 3.6 ohms.

Hope this helps!

Dave

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