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Calculate the active power in a 5 Ω resistor with 5 A current flowing through it.

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Calculate the active power in a 5 Ω resistor with 5 A current flowing through it.

(a) 125 W

(b) 110 W

(c) 115 W

(d) 126 W

I got this question by my college director while I was bunking the class.

My question is based upon DC Motors in division Characteristics of DC & AC Motors of Electric Drives

1 Answer

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The correct choice is (a) 125 W

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 90°. P=I^2R=5×5×5=125 W.

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