Question

An engine absorbs 2000J of heat from a hot reservoir and expels 750J to a cold reservoir during each operating cycle. What is the efficiency of the engine?

Answer 1

An engine absorbs 2000J of heat from a hot reservoir and expels 750J to a cold reservoir during each operating cycle. What is the efficiency of the engine?

The efficiency of the engine is the ratio between the heat expelled to a cold reservoir and the heat absorbed from a hot reservoir:

& alpha; = 750J / 2000J = 0.375.