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Calculate the heat absorbed by a 20 Ω resistor when 40 V is applied across it.

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Calculate the heat absorbed by a 20 Ω resistor when 40 V is applied across it.

(a) 120 W

(b) 100 W

(c) 80 W

(d) 110 W

I got this question in an internship interview.

Enquiry is from Motors Rating and Heating in portion Rating and Heating of Motors of Electric Drives

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Right option is (c) 80 W

Best explanation: The resistor always absorbs active power and dissipates in the form of the heat. Power absorbed by a 20 Ω resistor is 40×40÷20=80 W.

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