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Unformatted text preview: tovar (jdt436) 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 94 V( rms ), 91 Hz source is in series with a 21 mH inductor and a 22 resistor. What is the maximum rms current? Correct answer: 3 . 75049 A. Explanation: Let : f = 91 Hz , L = 0 . 021 H , R = 22 , and V rms = 94 V . The inductive reactance is X L = L = 2 f L = 2 (91 Hz) (0 . 021 H) = 12 . 0072 . 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 (22 ) 2 + (12 . 0072 ) 2 = 25 . 0634 . The rms current is I rms = V rms Z = 94 V 25 . 0634 = 3 . 75049 A . 002 (part 2 of 3) 10.0 points What is the power factor? Correct answer: 0 . 877775. Explanation: The phase angle in an RL circuit is the same as that of an RLC circuit, but without the capacitive reactance. Namelythe capacitive reactance....
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This note was uploaded on 12/11/2009 for the course PHY 303L taught by Professor Turner during the Spring '08 term at University of Texas at Austin.
 Spring '08
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