Question

Please Help!!! An engine takes 3,000 J from a hot reservoir and expels 2,400 J to a cold reservoir. What is the thermal efficiency of the engine? 20% 45% 60% 80% ... Don't Spam!​

Answer 1

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Thermal efficiency is a measure of the extent to which a heat engine is able to convert to other form. It is measure in percentage.

Thermal efficiency = $\frac{E_{out} }{E_{in} }$ × 100%

Where $E_{in}$ is the input energy and $E_{out}$ is the output energy.

Given that: $E_{in}$ = 2400 J and  $E_{out}$ = 3000 J, therefore:

Thermal efficiency = $\frac{2400}{3000}$ × 100%

                               = 80%

The thermal efficiency of the engine is 80%.

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