Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 18 - Electric Currents - General Problems - Page 524: 72

Answer

a. 1500 W. b. 12 A.

Work Step by Step

a. The power delivered to the interior, 950W, is 65 percent of the power drawn from the source. $$P_{in}=950W=0.65P_{source}$$ $$ P_{source}=\frac{950W}{0.65}\approx 1500W$$ b. Calculate the current drawn from the source by relating it to the source power and the voltage. $$ P_{source}=IV_{source}$$ $$ I=\frac{ P_{source}}{V_{source}}=\frac{1462W}{120V}\approx 12A$$
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