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Unformatted text preview: lakha (ml29327) HW#6 Jaafari (1444) 1 This printout should have 10 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points How long does it take for 10 C of charge to pass through a crosssectional area of a copper wire if I = 2 . 8 A? Correct answer: 3 . 57143 s. Explanation: Let : I = 2 . 8 A and Q = 10 C . I = Q t t = Q I = 10 C 2 . 8 A = 3 . 57143 s . 002 10.0 points A calculator is rated at 0.28 W when con nected to 2.00 V battery. What is the resistance of this device? Correct answer: 14 . 2857 . Explanation: Let : P = 0 . 28 W and V = 2 . 00 V . P = ( V ) 2 R R = ( V ) 2 P = (2 V) 2 . 28 W = 14 . 2857 . 003 (part 1 of 2) 10.0 points A string of 19 identical Christmas tree lights are connected in series to a 120 V source. The string dissipates 84 W. What is the equivalent resistance of the light string? Correct answer: 171 . 429 . Explanation: Let : V = 120 V and P = 84 W . Resistance is R = V 2 P = (120 V) 2 84 W = 171 . 429 . 004 (part 2 of 2) 10.0 points What is the resistance of a single light?...
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This note was uploaded on 09/17/2011 for the course PHYS 1401 taught by Professor Violaruck during the Fall '07 term at Dallas Colleges.
 Fall '07
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