Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)

Published by Pearson
ISBN 10: 0321740904
ISBN 13: 978-0-32174-090-8

Chapter 31 - Fundamentals of Circuits - Exercises and Problems - Page 915: 11

Answer

(a) $I = 11.6~A$ (b) $R = 10.3~\Omega$

Work Step by Step

(a) We can find the average power: $P = \frac{1000\times 10^3~W~h}{(30)(24~h)} = 1390~W$ We can find the average current: $P = IV$ $I = \frac{P}{V}$ $I = \frac{1390~W}{120~V}$ $I = 11.6~A$ (b) We can find the average resistance: $R = \frac{V}{I}$ $R = \frac{120~V}{11.6~A}$ $R = 10.3~\Omega$
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