5_Chapter 21 HomeworkCH21 Alternating Current Circuits and Electromagnetic Waves

# 5_Chapter 21 HomeworkCH21 Alternating Current Circuits and Electromagnetic Waves

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Alternating Current Circuits and Electromagnetic Waves 205 Problem Solutions 21.1 (a) () max rms 2 2 100 V 141 V VV ∆ = = ∆= (b) rms rms 100 V 20.0 A 5.00 V R = I == (c) max max 141 V 28.3 A 5.00 V R = I or max rms 2 2 20.0 A 28.3 A II = (d) 2 23 av rms 20.0 A 5.00 2.00 10 W 2.00 kW IR =× = P 21.2 2 2 2 max 2 max max av rms 1 22 2 V IV R R RR   = =     P , so 2 max av 2 V R = P (a) If 75.0 = P , then av W 2 170 V 193 275 .0 W R (b) If 10 = P , then av 0 W 2 170 V 145 2100 W R 21.3 The meters measure the rms values of potential difference and current. These are max rms 100 V 70.7 V V V = = , and
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## This document was uploaded on 10/20/2011.

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