Explanation Given data: Potential difference of cloth dryer is 240 V. Current drawn is 15 A. Time of operation is 45 min. Formula used: Write the expression for work done. W = P t (1) Here, P is power. t is time. Write the expression for power. P = I V (2) Here, I is current. V is potential difference. Work done is the energy used by the cloth dryer. Substitute IV for P in equation (2), W = I V t Time of operation in seconds is, t = ( 45 × 60

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Chapter 6, Problem 43E

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The Physical Universe

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The joules of energy used.

Solution Summary: The author explains that the joule of energy used is 9.7 MJ. The potential difference of cloth dryer is 240 V.

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