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Calculate the active power in an 8 Ω resistor with 8 A current flowing through it.

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Calculate the active power in an 8 Ω resistor with 8 A current flowing through it.

(a) 512 W

(b) 514 W

(c) 512 W

(d) 518 W

The question was asked in semester exam.

This question is from DC Motors in chapter Characteristics of DC & AC Motors of Electric Drives

1 Answer

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Right choice is (a) 512 W

For 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 90°. P = I^2R = 8×8×8 = 512 W.

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