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6_Ch 21 College Physics ProblemCH21 Alternating Current Circuits and Electromagnetic Waves

# 6_Ch 21 College Physics ProblemCH21 Alternating Current Circuits and Electromagnetic Waves

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206 CHAPTER 21 21.5 The total resistance (series connection) is 12 8.20 10.4 18.6 eq RRR = += + = , so the current in the circuit is rms rms 15.0 V 0.806 A 18.6 eq V I R == = The power to the speaker is then () ( ) 2 s 0.806 A 10.4 6.76 W speaker IR == = 2 av rm P 21.6 (a) ∆= , so max 150 V V max rms 150 V 106 V 22 V V = = (b) 377 rad s 60.0 Hz ω ππ = f (c) At ( ) 1120 s t = , ( ) ( ) 150 V sin 377 rad s 1 120 s 150 V sin rad 0 v π   = (d) max max 150 V 3.00 A 50.0 V R = I 21.7 1 2 C X fC = , so its units are 1 1 Volt Volt Ohm 1 Sec Farad 1 Sec Coulomb Volt Coulomb Sec
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