The instantaneous voltage through a device of impedance \( 20 \Omega \) is \( e=80 \sin 100 \pi ...

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The instantaneous voltage through a device of impedance \( 20 \Omega \) is \( e=80 \sin 100 \pi t \). The effective
\( \mathrm{P} \)
value of the current is:
W
(1) \( 1.732 \mathrm{~A} \)
(2) \( 2.828 \mathrm{~A} \)
(3) \( 3 \mathrm{~A} \)
(4) \( 4 \mathrm{~A} \)
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