21_Chapter 21 HomeworkCH21 Alternating Current Circuits and Electromagnetic Waves

# 21_Chapter 21 HomeworkCH21 Alternating Current Circuits and Electromagnetic Waves

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Alternating Current Circuits and Electromagnetic Waves 221 21.41 (a) At 90% efficiency, ( ) ( ) av av 0.90 output input = P P 1000 kW = Thus, if the input power to the primary is ( ) ( ) av output P ( ) av 3 1 000 kW 1.1 10 kW 0.90 0.90 output = = = × P av input P (b) ( ) 3 6 av 2 1, rms 1, rms 1, rms 1.1 10 kW 1.1 10 W 3.1 10 A 3 600 V input V V × × = = × P I = = (c) ( ) 6 av 3 2, rms 2, rms 1, rms 1 000 kW 1.0 10 W 8.3 10 A 120 V output V V × = = × P I = = 21.42 ( )( ) 4 5 4.50 10 m 6.44 10 m 290 line R = × × = (a) The power transmitted is ( ) ( ) av rms rms transmitted V I = ∆ P so ( ) 6 3 0 10 W 10.0 A 0 10 V × = × ( ) ( ) av rms rms 5.0 50 transmitted I
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