Spring 11 Phys 121 - HW 14

Spring 11 Phys 121 - HW 14 - dzifanu (sd26397) hw 14...

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dzifanu (sd26397) – hw 14 – opyrchal – (121102) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page – Fnd all choices before answering. 001 (part 1 of 3) 10.0 points In a certain RLC circuit, the rms current is 8 . 8 A, the rms voltage is 139 V, and the current leads the voltage by 69 . 2 . What is the total resistance of the circuit? Correct answer: 5 . 60907 Ω. Explanation: Let : I rms = 8 . 8 A , V rms = 139 V , and φ = - 69 . 2 . Z = V rms I rms = 139 V 8 . 8 A = 15 . 7955 Ω , and R = Z cos φ = (15 . 7955 Ω) cos( - 69 . 2 ) = 5 . 60907 Ω . 002 (part 2 of 3) 10.0 points Calculate the total reactance, X L - X C . Correct answer: - 14 . 766 Ω. Explanation: ±rom tan φ = X L - X C R , we Fnd X L - X C = R tan φ = (5 . 60907 Ω) tan( - 69 . 2 ) = - 14 . 766 Ω . 003 (part 3 of 3) 10.0 points ±ind the average power dissipated in the cir- cuit. Correct answer: 434
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Spring 11 Phys 121 - HW 14 - dzifanu (sd26397) hw 14...

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