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Unformatted text preview: terry (ect328) – homework 27 – 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 An AC voltage of the form V = V max sin2 πft, with frequency 69 Hz and maximum voltage 851 V, is applied across an 80 W light bulb. When the voltage is first applied, what is the current through the circuit? 1. the rms current 2. the maximum current 3. correct Explanation: Let : t = 0 . The current in the circuit is I = I max sin(2 π 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: 0 . 188014 A. Explanation: Let : V max = 851 V and P = 80 W . t = T 4 = 1 4 f The current in the circuit is I = I max sin(2 π f t ) = I max sin parenleftbigg 2 π f 4 f parenrightbigg = I max sin parenleftBig π 2 parenrightBig = I max = 2 P V max = 2 (80 W) 851 V = . 188014 A...
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This note was uploaded on 02/17/2010 for the course PHY 59130 taught by Professor Turner during the Fall '09 term at University of Texas.
 Fall '09
 Turner

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