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Calculate the active power in a 7481 H inductor.

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Calculate the active power in a 7481 H inductor.

(a) 1562 W

(b) 4651 W

(c) 0 W

(d) 4654 W

This question was posed to me during an interview.

My question is taken from DC Motors in division Characteristics of DC & AC Motors of Electric Drives

1 Answer

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Correct answer is (c) 0 W

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. Voltage leads the current in case of the inductor.

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