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Calculate the reactive power in a 45 Ω resistor with 1.78 A current flowing through it.

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in Electric Drives by (99.8k points)
Calculate the reactive power in a 45 Ω resistor with 1.78 A current flowing through it.

(a) 28.8 VAR

(b) 23.4 VAR

(c) 25.82 VAR

(d) 0 VAR

This question was posed to me in my homework.

The doubt is from Speed Control of Series Motor in section Speed Control of Direct Current Motors & Induction Motors of Electric Drives

1 Answer

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Right choice is (d) 0 VAR

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=VIsin(0°)=0 VAR.

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