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OpenStudy (anonymous):
If you have a device that has an energy efficiency of 0.4 and you put in 100 units of energy, how many units of useful energy will you get out of it?
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OpenStudy (kropot72):
\[\large Energy\ efficiency=\frac{energy\ output}{energy\ input}\] Therefore we can write: energy output = (energy input) * (efficiency) = 100 * 0.4 = you can calculate
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