lect06_handout - Physics 102: Lecture 06 Kirchhoff's Laws...

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Physics 102: Lecture 6, Slide 1 Kirchhoff’s Laws Physics 102: Lecture 06
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Physics 102: Lecture 6, Slide 2 Last Time Resistors in series: Resistors in parallel: Current thru is same; Voltage drop across is IR i Voltage drop across is same; Current thru is V/R i Last Lecture Solved Circuits What about this one? Today ܴ ݁ݍ ൌܴ 1 ൅ܴ 2 ൅ܴ 3 ൅ڮ 1 ܴ ݁ݍ 1 ܴ 1 1 ܴ 2 1 ܴ 3 ൅ڮ
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Physics 102: Lecture 6, Slide 3 Kirchhoff’s Rules • Kirchhoff’s Junction Rule (KJR): – Current going in equals current coming out. • Kirchhoff’s Loop Rule (KLR): – Sum of voltage drops around a loop is zero.
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Physics 102: Lecture 6, Slide 4 • Conceptual basis: conservation of charge • At any junction in a circuit, the current that enters the junction equals the current that leaves the junction •E x a m p l e : R 1 R 2 R 3 I 1 I 3 I 2 ε 1 ε 2 Kirchhoff’s Junction Rule (KJR) At junction: I 1 + I 2 = I
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Physics 102: Lecture 6, Slide 5 • Conceptual basis: conservation of energy • Going around any complete loop in a circuit, the sum total of all the potential differences is zero •E x a m p l e : R 1 R 2 R 3 I 1 I 3 I 2 ε 1 ε 2 Kirchhoff’s Loop Rule (KLR) Around the right loop: ε 2 + I 3 R 3 + I 2 R 2
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Physics 102: Lecture 6, Slide 6 Using Kirchhoff’s Rules (1) Label all currents Choose any direction (2) Label +/- for all elements Current goes + – (for resistors)
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This note was uploaded on 02/04/2012 for the course PHYSICS 102 taught by Professor Demarco during the Spring '11 term at University of Illinois at Urbana–Champaign.

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lect06_handout - Physics 102: Lecture 06 Kirchhoff's Laws...

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