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# hw6 - lakha(ml29327 HW#6 Jaafari(1444 This print-out should...

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lakha (ml29327) – HW#6 – Jaafari – (1444) 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 10.0 points How long does it take for 10 C of charge to pass through a cross-sectional area of a copper wire if I = 2 . 8 A? Correct answer: 3 . 57143 s. Explanation: Let : I = 2 . 8 A and Δ Q = 10 C . I = Δ Q Δ t Δ t = Δ 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 Ω. Explanation: Let : P = 0 . 28 W and Δ V = 2 . 00 V . P = V ) 2 R R = V ) 2 P = (2 V) 2 0 . 28 W = 14 . 2857 Ω . 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 Ω. Explanation: Let : V = 120 V and P = 84 W . Resistance is R = V 2 P = (120 V) 2 84 W = 171 . 429 Ω . 004 (part 2 of 2) 10.0 points What is the resistance of a single light? Correct answer: 9 . 02256 Ω. Explanation: Let : n = 19 . R = n R 1 , so R 1 = R n = 171 . 429 Ω 19 = 9 . 02256 Ω .

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hw6 - lakha(ml29327 HW#6 Jaafari(1444 This print-out should...

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