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Calculate the active power in a .45 H inductor.

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Calculate the active power in a .45 H inductor.

(a) 0.11 W

(b) 0.14 W

(c) 0.15 W

(d) 0 W

I got this question in class test.

The origin of the question is Methods of Starting Electric Motors in portion Starting of Electric Drives

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The correct answer is (d) 0 W

Easiest 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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