Physics Thermodynamics Heat engines

The amount of heat absorbed by a heat engine is H, the amount of useful work done is W and the remaining heat is H'. The efficiency of this engine is given as

1
\(\frac{H}{W}\)
2
\(1 - \frac{H}{W}\)
3
\(1- \frac{H'}{H}\)
4
\(\frac{H'}{H}\)

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