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Calculate the reactive power in a 725.45 Ω resistor.

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Calculate the reactive power in a 725.45 Ω resistor.

(a) 122.1 VAR

(b) 261.1 VAR

(c) 0 VAR

(d) 199.7 VAR

The question was asked in class test.

This key question is from Induction Motors topic in section Speed Control of Direct Current Motors & Induction Motors of Electric Drives

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Right choice is (c) 0 VAR

The explanation: The resistor is a linear element. It only absorbs real power and dissipates it in the form of heat. The voltage and current are in the same phase in case of the resistor so the angle between V & I is 0°. Q = VIsin0° = 0 VAR.

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