How Does the Efficiency Formula Change for Reversible Heat Engines?

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ajayguhan
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efficiency n=1 -(q1/q2) for a normal heat engine

But how efficiency n=1 -(t1/t2) ? for reversible heat engine
 
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When using the temperatures, you find the theoretical highest efficiency possible for a specific system.

When using the "Q" (heat), you find the actual efficiency of the system.
 

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