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Calculate the active power in a 788 ω resistor with 178 A current flowing through it.

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in Electric Drives by (99.6k points)
Calculate the active power in a 788 ω resistor with 178 A current flowing through it.

(a) 24.96 MW

(b) 24.44 MW

(c) 24.12 MW

(d) 26.18 MW

The question was posed to me in final exam.

My question comes from DC Motors in section Characteristics of DC & AC Motors of Electric Drives

1 Answer

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The correct option is (a) 24.96 MW

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=178×178×788=24.96 MW.

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