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OpenStudy (anonymous):

what is the energy input device that provides 20 units of useful energy and has an efficiency of 0.25?

OpenStudy (neonumbrella5115):

I can give you the energy input, but not the device name. Are you sure you typed the question correctly?

OpenStudy (anonymous):

I think I got it I took 20 x 0.25 and got 5 @neonumbrella5115

OpenStudy (neonumbrella5115):

Yes, that is correct! Since, Efficiency = energy output (given) / energy input (taken) 0.25 = 20 / x

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