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Chap26_PHY2049

# Chap26_PHY2049 - Chapter 26 Direct-Current and Circuits...

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Chapter 26 – Direct-Current and Circuits - Resistors in Series and Parallel - Kirchhoff’s Rules - Electric Measuring Instruments - R-C Circuits

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1. Resistors in Series and Parallel Resistors in Series: V ax = I R 1 V xy = I R 2 V yb = I R 3 V ab = V ax + V xy + V yb = I (R 1 + R 2 + R 3 ) V ab /I = R 1 + R 2 + R 3 = R eq Resistors in Parallel: I 1 = V ab /R 1 I 2 = V ab /R 2 I 3 = V ab /R 3 I = I 1 + I 2 + I 3 = V ab (1/R 1 + 1/R 2 + 1/R 3 ) barb2right I/V ab = 1/R eq ... 3 2 1 + + + = R R R R eq ... 1 1 1 1 3 2 1 + + + = R R R R eq
2. Kirchhoff’s Rules Junction: point where three or more conductors meet (nodes, branch points). Loop: closed conducting path. Kirchhoff’s junction rule: the algebraic sum of the currents into any junction is zero. 0 = Σ I

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Kirchhoff’s loop rule: the algebraic sum of the potential difference in any loop, Including those associated with emfs and those of resistive elements, must equal zero. 0 = Σ V -The junction rule is based on conservation of electric charge . No charge can accumulate at a junction barb2right total charge entering the junction per unit time = total charge leaving.
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Chap26_PHY2049 - Chapter 26 Direct-Current and Circuits...

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