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Wattmeter reading has errors induced by _________

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Wattmeter reading has errors induced by _________

(a) resistance

(b) self-capacitance

(c) self-inductance

(d) mutual inductance

This question was addressed to me during an interview.

This question is from Errors in Dynamometer Wattmeter in portion Measurement of Power and Related Parameters of Electrical Measurements

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The correct choice is (d) mutual inductance

For explanation: Due to mutual inductance between the current and pressure coil in a wattmeter, errors are introduced. Errors are negligible at power frequencies whereas they have a considerable value at higher frequencies.

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