The frequency of an alternating voltage is \( 50 \mathrm{cycle} / \mathrm{sec} \) and its amplit...

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The frequency of an alternating voltage is \( 50 \mathrm{cycle} / \mathrm{sec} \) and its amplitude is \( 120 \mathrm{~V} \). Then the
\( \mathrm{P} \)
rms value of voltage is:
W
(1) \( 56.5 \mathrm{~V} \)
(2) \( 70.7 \mathrm{~V} \)
(3) \( 101.3 \mathrm{~V} \)
(4) \( 84.8 \mathrm{~V} \)
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