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Unformatted text preview: terry (ect328) – homework 32 – Turner – (59130) 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 174 V( rms ), 78 Hz source is in series with a 21 mH inductor and a 10 Ω resistor. What is the maximum rms current? Correct answer: 12 . 1254 A. Explanation: Let : f = 78 Hz , L = 0 . 021 H , R = 10 Ω , and V rms = 174 V . The inductive reactance is X L = ω L = 2 π f L = 2 π (78 Hz) (0 . 021 H) = 10 . 2919 Ω . The impedance of an RL circuit is the same as that of an RLC circuit, but without the capacitive reactance. Namely Z = R 2 + X 2 L = (10 Ω) 2 + (10 . 2919 Ω) 2 = 14 . 35 Ω . The rms current is I rms = V rms Z = 174 V 14 . 35 Ω = 12 . 1254 A . 002 (part 2 of 3) 10.0 points What is the power factor? Correct answer: 0 . 696864....
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 Spring '10
 Turner
 Inductance, RLC, Correct Answer, Inductor, RL circuit

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