Physics1C_Chapter31_part1

Physics1C_Chapter31_part1 - CHAPTER 31 ALTERNATING CURRENT...

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CHAPTER 31 ALTERNATING CURRENT Vahé Peroomian
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AC VS. DC Edison advocated direct current (DC) Westinghouse advocated alternating current (AC) because: Transformers could be used to step the voltage up and down for AC but not for DC. Low voltage safer for home use. High voltages and small currents best for long-distance transmission (minimizing i 2 R )
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AC SOURCE Coil of wire rotating with constant angular velocity (Chapter 29) generates sinusoidally alternating emf. Voltage usually described by v = ς χοσϖτ ι=Ιχοσϖτ
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PHASOR DIAGRAMS A vector rotating with a constant angular velocity is called a phasor .
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RECTIFIED ALTERNATING CURRENT Rectified average current I rav = 2 π Ι=0.637Ι
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ROOT-MEAN-SQUARE VALUES RMS value of a sinusoidal current: RMS voltage: I rms = Ι 2 V rms = ς 2
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EXAMPLE 1 The voltage output of an AC source is given by the expression Δv = 200 sin ωt, where Δv is in volts. Find the rms current in the circuit when this source is connected to a 100-Ω resistor.
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EXAMPLE 31.1
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This note was uploaded on 06/03/2011 for the course PHYSICS 1c taught by Professor Peroomian during the Spring '10 term at UCLA.

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Physics1C_Chapter31_part1 - CHAPTER 31 ALTERNATING CURRENT...

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