College Physics (7th Edition)

Published by Pearson
ISBN 10: 0-32160-183-1
ISBN 13: 978-0-32160-183-4

Chapter 21 - AC Circuits - Learning Path Questions and Exercises - Multiple Choice Questions - Page 747: 2

Answer

(b) $\frac{1}{120}s$

Work Step by Step

AC frequency is US=60Hz Time for 1 cycle = (1/60) s In 1 cycle, the direction of AC voltage is reversed after half cycle so the direction of AC voltage remains for half the time of 1 cycle i.e. (1/120)s.
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