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Kirchoff and the Circuit October 20, 2012

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Rules for Review Parallel 1/R T = 1/R 1 + 1/R 2 +... I T = I 1 + I 2 +... V 1 = V 2 =... Series V T = V 1 + V 2 +... I T = I 1 = I 2 =... R T = R 1 + R 2 +...

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And What About Energy? Capacitors Store It U = 1/2 QV Resistors Use It P = IV where P is Power (watts) P = I 2 R = V 2 /R

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Practice Lets find some current and potential differences and power values

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So What if the Circuits are Ridiculous? Thanks be to Kirchoff. Two Rules to solve ANY circuit. Rule 1: Junction Rule: Current flowing into any junction = current flowing out Rule 2: Loop Rule: Sum of the potential differences around any complete loop = 0

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Sample Problem Find the current When is V positive and when is it negative Depends on direction of the current and of the loop Loop Sign Rules

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Sample Problem Find each current Find the voltage across each resistor.

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