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Unformatted text preview: Kapoor (mk9499) – oldhomework 27 – Turner – (60230) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points An AC power supply produces a maximum voltage of 90 V. This power supply is con- nected to a 22 Ω resistor, and the current and resistor voltage are measured with an ideal AC ammeter “A” and an ideal AC voltmeter “V”, as in the figure. V A E = E max sin ωt E max = 90 V S 22 Ω What does the voltmeter read? Note: Re- call that an ideal ammeter has zero resistance and an ideal voltmeter has infinite resistance. Correct answer: 63 . 6396 V. Explanation: Let : V max = 90 V . The voltmeter reads the rms voltage V rms = V max √ 2 = 90 V √ 2 = 63 . 6396 V . 002 (part 2 of 2) 10.0 points What is the reading of the ammeter? Correct answer: 2 . 89271 A. Explanation: Let : R = 22 Ω . The ammeter reads the rms current I rms = V rms R = 63 . 6396 V 22 Ω = 2 . 89271 A ....
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