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Unformatted text preview: nguyen (jmn727) – homework 32 – Turner – (59070) 1 This printout should have 10 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 3) 10.0 points In an LR circuit, a 190 V( rms ), 85 Hz source is in series with a 15 mH inductor and a 30 Ω resistor. What is the maximum rms current? Correct answer: 6 . 11893 A. Explanation: Let : f = 85 Hz , L = 0 . 015 H , R = 30 Ω , and V rms = 190 V . The inductive reactance is X L = ω L = 2 π f L = 2 π (85 Hz) (0 . 015 H) = 8 . 01106 Ω . The impedance of an RL circuit is the same as that of an RLC circuit, but without the capacitive reactance. Namely Z = radicalBig R 2 + X 2 L = radicalBig (30 Ω) 2 + (8 . 01106 Ω) 2 = 31 . 0512 Ω . The rms current is I rms = V rms Z = 190 V 31 . 0512 Ω = 6 . 11893 A . 002 (part 2 of 3) 10.0 points What is the power factor? Correct answer: 0 . 966146....
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This note was uploaded on 01/21/2010 for the course PHY 303L taught by Professor Turner during the Spring '08 term at University of Texas.
 Spring '08
 Turner
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