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Calculate the active power in a 41 H inductor.

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in Electric Drives by (99.8k points)
Calculate the active power in a 41 H inductor.

(a) 2 W

(b) 1 W

(c) 0 W

(d) .5 W

This question was posed to me during an interview.

My question is from DC Motors topic in portion Characteristics of DC & AC Motors of Electric Drives

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The correct answer is (c) 0 W

The best I can explain: 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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