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Answer: The ratio of work performed to Heat absorbed throughout a cycle is known as a heat engine’s thermal efficiency. Using the definition as a guide, the formula is
Efficiency = Heat absorbed/work done by the engine.
η = W/Q1 = (Q1-Q2)/Q1
= 1- (Q2/Q1)
The quantity of Heat absorbed is Q1.
The quantity of Heat was rejected in Q2.
W represents how much work the system has completed.
The engine will operate at total efficiency if Q2 is zero. That indicates that no heat is being rejected to the sink.
