The instantaneous voltage through a device of impedance \( 20 \Omeg...

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