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===About Efficiency===
: '''Power efficiency''' is a [[measure]] of how effectively [[energy]] is [[Energy Transfer|transferred]] from one [[Energy Store|energy store]] into an intended [[Energy Store|energy store]].
: '''Efficiency''' may be written as a [[percentage]] or as a [[decimal]].: '''Efficiency''' as a [[percentage]] can never be greater than 100% and as a [[decimal]] can never be greater than 1 because you can never get more [[energypower]] out than you put in due to [[Conservation of Energy]].
===Equation===
<math>Efficiency = \frac{P_{Useful}}{P_{Total}}</math>
Where:
P<sub>Useful</sub> = The useful power [[Energy Transfer|transferred]] to a device's intended purpose.
P<sub>Total</sub> = The total power [[Energy Transfer|transferred]] to a [[system]].