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Course: PHYSICS 112, Fall 2009School: Idaho State
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112 Lecture PHYSICS 14 Review Lecture 13 Current Resistance Ohm's law Power Battery (EMF) 14.1. Circuit elements 14.2.Kirchhoff's junction law The total current into a junction must equal the total current leaving the junction 14.3.Kirchhoff's loop law The sum of all the potential differences around the loop is zero. i Vloop = 0 Vbat1 + Vbat 2 - IR1 - IR2 = 0 9 V 20 40 9V - 6V - I - (40) I (20) =...
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112
Lecture PHYSICS 14
Review Lecture 13
Current Resistance Ohm's law Power
Battery (EMF)
14.1. Circuit elements
14.2.Kirchhoff's junction law
The total current into a junction must equal the total current leaving the junction
14.3.Kirchhoff's loop law
The sum of all the potential differences around the loop is zero.
i
Vloop = 0
Vbat1 + Vbat 2 - IR1 - IR2 = 0
9 V 20
40
9V - 6V - I - (40) I (20) = 0 3V = I (60) 3V I= = 0.05 A 60
i
6 V
14.4. Series and parallel circuits
Series circuit
Parallel circuit
14.5. Series circuit
I1 V1 I2 V2 I3 V3
I V
I1 = I 2 = I 3 = I V1 + V2 + V3 = V
Kirchhoff's junction rule K...
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