Answer
$\phi = 30^{\circ}$
Work Step by Step
We can find the phase angle:
$P = P_{max}~cos^2~\phi$
$0.75~P_{max} = P_{max}~cos^2~\phi$
$cos^2~\phi = 0.75$
$cos~\phi = \sqrt{0.75}$
$cos~\phi = 0.866$
$\phi = cos^{-1}~(0.866)$
$\phi = 30^{\circ}$
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
by Knight, Randall D.
Published by
Pearson
ISBN 10:
0133942651
ISBN 13:
978-0-13394-265-1
Chapter 32 - AC Circuits - Exercises and Problems - Page 925: 36
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