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Unformatted text preview: Platt, David Homework 26 Due: Nov 9 2005, 4:00 am Inst: Ken Shih 1 This printout should have 8 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 3) 10 points An effective AC voltage of 145 V at 60 Hz is applied to an RLC circuit with 27 . 4 mH inductor, 0 . 52 F capacitor, and 45 resistor in series. 27 . 4 mH 45 145 V S . 52 F I What is the effective current? Correct answer: 0 . 0284817 A. Explanation: Let : V = 145 V , f = 60 Hz , C = 0 . 52 F = 5 . 2 10 7 F , L = 27 . 4 mH = 0 . 0274 H , and R = 45 . For an RLC series circuit at f = 60 Hz, X L = 2 f L = 2 (60 Hz) (0 . 0274 H) = 10 . 3296 , and X C = 1 2 f C = 1 2 (60 Hz) (5 . 2 10 7 F) = 5101 . 12 , so the total impedance is Z = R 2 + ( X L X C ) 2 = (45 ) 2 + (10 . 3296 ) (5101 . 12 ) 2 1 / 2 = 5090 . 99 ....
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 Spring '10
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