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Calculate the active power in a 487 H inductor.

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Calculate the active power in a 487 H inductor.

(a) 2482 W

(b) 1545 W

(c) 4565 W

(d) 0 W

The question was asked in a national level competition.

This key question is from DC Motors topic in division Characteristics of DC & AC Motors of Electric Drives

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The correct choice is (d) 0 W

Easy explanation: The inductor is a linear element. It only absorbs reactive power and stores it in the form of oscillating energy. The voltage and current are 90° in phase in case of the inductor so the angle between V & I is 90°. P = VIcos90 = 0 W.

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