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## Main Question or Discussion Point

We know efficiency (η) = W

Now in any cycle, for instance, the Otto cycle, let the total work output be W

Then, will efficiency be equal to (η) = (W

Or will it be equal to (η) = W

_{output}/W_{input}Now in any cycle, for instance, the Otto cycle, let the total work output be W

_{O}, total heat added be W_{H}& the total work done on the gas to compress it be W_{C}.Then, will efficiency be equal to (η) = (W

_{O}-W_{C})/W_{H}?Or will it be equal to (η) = W

_{O}/(W_{H}+W_{C}) ?