lecture12

# lecture12 - Physics 2102 Gabriela Gonzlez b a Physics 2102...

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Physics 2102 Circuits Physics 2102 Gabriela González b a

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DC circuits: resistances in series Two resistors are “in series” if they are connected such that the same current flows in both. The “equivalent resistance” is a single imaginary resistor that can replace the resistances in series. “Walking the loop” results in : E i R1- i R2- i R3=0 i = E /(R1+R2+R3) In the circuit with the equivalent resistance, E i Req=0  i = E /Req Thus, = = n j j eq R R 1
Multiloop circuits: resistors in parallel Two resistors are “in parallel” if they are connected such that there is the same potential drop through both. The “equivalent resistance” is a single imaginary resistor that can replace the resistances in parallel. “Walking the loops” results in : E i 1R1=0, E i 2R2=0, E i 3R3=0 The total current delivered by the battery is i = i 1+ i 2+ i 3 = E /R1+ E /R2+ E /R3. In the circuit with the equivalent resistor, i = E /Req. Thus, = = n j j eq R R 1 1 1

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Resistors and Capacitors Resistors Capacitors Key formula : V= i R Q=CV In series : same current same charge Req=∑Rj 1/Ceq= ∑1/Cj In parallel : same voltage same voltage 1/Req= ∑1/Rj Ceq=∑Cj
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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 Gabriela Gonzlez b a Physics 2102...

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