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When an alternating current given by I = 10sin (120π)t passes through a 12Ω r...


Question

When an alternating current given by I = 10sin (120π)t passes through a 12Ω resistor, the power dissipated in the resistor is

Options

A) 1200W

B) 600W

C) 120W

D) 30W


The correct answer is A.

Explanation:

An a.c current is usually expressed as I = Io sin wt; and comparing this with the given current I = 10sin (120π)t, => Io = 10.
and power in an a.c circuit is given as:
P = I2R
= (102 x 12)
= 1200W

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