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Unformatted text preview: tovar (jdt436) homework 27 Turner (59070) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 3) 10.0 points An AC voltage of the form V = V max sin2 ft, with frequency 89 Hz and maximum voltage 144 V, is applied across an 85 W light bulb. When the voltage is first applied, what is the current through the circuit? 1. the maximum current 2. the rms current 3. correct Explanation: Let : t = 0 . The current in the circuit is I = I max sin(2 f t ) = I max sin 0) = . 002 (part 2 of 3) 10.0 points When t = T 4 , where T is the period of the applied voltage, what is the current in the circuit? Correct answer: 1 . 18056 A. Explanation: Let : V max = 144 V and P = 85 W . t = T 4 = 1 4 f The current in the circuit is I = I max sin(2 f t ) = I max sin parenleftbigg 2 f 4 f parenrightbigg = I max sin parenleftBig 2 parenrightBig = I max = 2 P V max = 2 (85 W) 144 V = 1 . 18056 A...
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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