lecture12

# lecture12 - Physics 2102 Jonathan Dowling Physics 2102...

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Physics 2102 Physics 2102 Lecture 12 Lecture 12 DC circuits, RC circuits DC circuits, RC circuits Physics 2102 Jonathan Dowling

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How to Solve Multi-Loop Circuits How to Solve Multi-Loop Circuits
Step I: Simplify “Compile” Circuits Step I: Simplify “Compile” Circuits Resistors Capacitors Key formula : V=iR Q=CV In series : same current same charge R eq =∑R j 1/C eq = ∑1/C j In parallel : same voltage same voltage 1/R eq = ∑1/R j C eq =∑C j

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Around every loop add + E if you cross a battery from minus to plus, E if plus to minus, and –iR for each resistor. Then sum to Zero: + E 1 E 2 – iR 1 – iR 2 = 0. Step II: Apply Loop Rule Step II: Apply Loop Rule R 1 R 2 E 1 E 2 + + Conservation of ENERGY!
Step II: Apply Junction Rule Step II: Apply Junction Rule At every junction sum the ingoing currents and outgoing currents and set them equal. i 1 = i 2 + i 3 i 1 i 2 i 3 Conservation of CHARGE!

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Step III: Equations to Unknowns Continue Steps I–III until you have as many equations as unknowns! + E
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## This note was uploaded on 11/18/2011 for the course PHYSICS 2102 taught by Professor Dowling during the Fall '10 term at LSU.

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lecture12 - Physics 2102 Jonathan Dowling Physics 2102...

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