Conceptual Physics (12th Edition)

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

Chapter 23 - Think and Solve - Page 448: 47


$ \$2.52$.

Work Step by Step

First, change watts to kilowatts and the time to hours, since we are given the cost per kilowatt-hour. 100 W = 0.1 kW = 0.1 kilowatt. There are 24 hours a day, and 7 days in a week, so there are 168 hours in a week. Now find the number of kilowatt-hours used. $$(0.1 kW)(168 hours) = 16.8 kWh$$ The cost is 15 cents per kWh, so the total is $ \$2.52$.
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