The root mean square value of the alternating current is equal to \...

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The root mean square value of the alternating current is equal to
\( \mathrm{P} \)
(1) Twice the peak value
\( \mathrm{W} \)
(2) Half the peak value
(3) \( \frac{1}{\sqrt{2}} \) times the peak value
(4) Equal to the peak value
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