A Carnot engine working between 400 K and 800 K has a work output of 1200 J per cycle. What is the amount of heat energy supplied to the engine from the source per cycle?

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Given: T h ​ = 800 K , T c ​ = 400 K , W = 1200 J Carnot efficiency: η = 1 − T h ​ T c ​ ​ η = 1 − 800 400 ​ = 0.5 Efficiency relation: η = Q h ​ W ​ Heat supplied per cycle: Q h ​ = η W ​ = 0.5 1200 ​ = 2400 J Answer: Q h ​ = 2400 J p ercyc l e ​

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