Answer
21 V
Work Step by Step
$\overline{P}=\frac{V_{rms}^{2}}{R}\implies V_{rms}=\sqrt {\overline{P}\times R}$
$=\sqrt {55\,W\times4.0\,\Omega}=15\,V$
Thus, it follows:
$V_{0}=V_{rms}\times \sqrt 2=15\,V\times\sqrt 2=21\,V$
Physics (10th Edition)
by Young, David; Stadler, Shane
Published by
Wiley
ISBN 10:
1118486897
ISBN 13:
978-1-11848-689-4
Chapter 20 - Electric Circuits - Problems - Page 574: 37
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