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hw 27 - nguyen(jmn727 homework 27 Turner(59070 This...

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nguyen (jmn727) – 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 πft , with frequency 22 Hz and maximum voltage 713 V, is applied across a 33 W light bulb. When the voltage is first applied, what is the current through the circuit? 1. 0 correct 2. the maximum current 3. the rms current Explanation: Let : t = 0 . The current in the circuit is I = I max sin(2 π f t ) = I max sin 0) = 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 . 0925666 A. Explanation: Let : V max = 713 V and P = 33 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 (33 W) 713 V = 0 . 0925666 A . 003 (part 3 of 3) 10.0 points What is the rms current in the circuit?
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