When discussing engines the ratio of up at work to input work expressed as a percentage is called....

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09-01-2019
Physics

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When discussing engines the ratio of up at work to input work expressed as a percentage is called....

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schlijes000 schlijes000 · Answer 1 · 2019-01-14T21:56:11+01:00

Efficiency η is the ratio of input work over the output work. It is defined as:

η=work done/heat absorbed=(Q₂-Q₁)/Q₁ where Q₁ is the heat absorbed and Q₂-Q₁ is the work done.

This ratio is never greater or equal to 1, or 100% because the second law of thermodynamics doesn't allow it.

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