Devices are designed to ____ as little energy as possible. This means that as much of the input energy as possible should be ____ into ____ energy stores. How good a device is at transferring energy input to useful energy output is called ____. A very ____ device will waste very little of its input energy. A very ____ device will waste most of its input energy. The efficiency of a device is the proportion of the ____ supplied that is transferred in useful ways.

Efficiency

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