Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 23 - Think and Solve: 45

Answer

10 A. $12 \Omega$.

Work Step by Step

First find the current that is drawn. $$Electric \; power = (current) \times (voltage)$$ $$1200 W = (I)(120 V)$$ Solve for I = 10 A. Second, find the toaster's resistance. $$Current = \frac{voltage}{resistance}$$ Rearranging to solve for the resistance, we obtain $$Resistance= \frac{voltage}{current}$$ Put the numbers in from this problem. $$Resistance= \frac{120 V}{10 A} = 12 \Omega$$
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