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 18th November 2004, 05:58 PM #1 diyAudio Member     Join Date: Jun 2004 Location: israel Basic Formulas Hi, i'm having a test on electricity next week so i just wanted to ask if some of u guys have a web site or some reference to read about ohm law formula and some expentions for: * Watt * Resistance * Voltage * Current in parralel/serial and JOINED circuit. and also about calculation JOINED circuit with 3 power sources and common resistors. like : e1 = I1(r1+r2+r3) - I2(r3) - I3(r2) e2 = -I1(r1) + I2(x,x,x) - I3(x) .... thanks! Chen
 18th November 2004, 06:46 PM #2 diyAudio Member     Join Date: Jan 2003 Location: Milwaukee, WI Hmm... should I give in... or should I tell him to be a good boy and Google it (or grab a piece of paper, R = V/I and P = V*I and figure them out) himself... Tim __________________ Seven Transistor Labs Projects and Resources
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Join Date: Jul 2003
Location: S Yorkshire OK
Re: Basic Formulas

Quote:
 Originally posted by Morbid ...and also about calculation JOINED circuit with 3 power sources and common resistors.
Kirchoff would be a word to google with...

 18th November 2004, 09:15 PM #4 diyAudio Member     Join Date: Jan 2003 Location: Milwaukee, WI Actually, that's superposition something or other. I don't actually know anything about it but I saw a thread about it elsewhere. Tim __________________ Seven Transistor Labs Projects and Resources
 19th November 2004, 10:01 PM #5 diyAudio Member   Join Date: Nov 2004 Location: USA - Ohio Superposition is quite simple. Look at current/voltage sources one at a time. Replace other current sources with an open-circuit, and replace other voltage sources with a short-circuit. Solve for these simpler circuits individually, and when you get whatever value you are looking for, add the simple answers together to get the total value. Here is an example I found in google: Superposition example Hope it helps

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