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In A.C. circuits, power is measured using ________

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In A.C. circuits, power is measured using ________

(a) voltmeter

(b) ammeter

(c) ohmmeter

(d) wattmeter

This question was addressed to me in unit test.

This question is from Dynamometer Type Wattmeter in division Measurement of Power and Related Parameters of Electrical Measurements

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Right choice is (d) wattmeter

The best I can explain: A.C. circuits make use of power factor of the circuit in addition to the current flowing through the circuit and the voltage across the circuit. As a result, a wattmeter is used to measure A.C. power.

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