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Which among the following varies in both magnitude and sign over a cycle?

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in Physics – Class 12 by (135k points)
Which among the following varies in both magnitude and sign over a cycle?

(a) Apparent power

(b) Effective power

(c) Instantaneous power

(d) Average power

The question was asked in quiz.

My doubt is from Power in AC Circuit : The Power Factor in portion Alternating Current of Physics – Class 12

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Correct choice is (c) Instantaneous power

The best I can explain: Instantaneous power is defined as the power in an AC circuit at any instant of time. It is equal to the product of values of alternating voltage and alternating current at that time. And, because instantaneous power varies in both magnitude and sign over a cycle, it seldom has any practical importance.

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