College Physics (7th Edition)

by Wilson, Jerry D.; Buffa, Anthony J.; Lou, Bo

Published by Pearson

ISBN 10: 0-32160-183-1

ISBN 13: 978-0-32160-183-4

Chapter 17 - Electric Current and Resistance - Learning Path Questions and Exercises - Multiple Choice Questions - Page 617: 21

Answer

(d) decreases by a factor of 4

Work Step by Step

The power dissipated in wire with current $I$ is given by $I^{2}R$ So, if current is halved, the power dissipation will decrease by a factor of ${2^{2}}=4$

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