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Calculate the active power in an 8764 H inductor.

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Calculate the active power in an 8764 H inductor.

(a) 8645 W

(b) 6485 W

(c) 0 W

(d) 4879 W

This question was posed to me in an interview.

This intriguing question comes from Methods to Reduce the Energy Loss During Starting topic in chapter Starting of Electric Drives

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The correct answer is (c) 0 W

The 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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