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===Meaning===
'''Useful energy''' is the [[Energy Transfer|energy transferred]] to a device's intended purpose.
===About Useful Energy===
: When [[energy]] is [[Energy Transfer|transferred]], the [[Total Energy|total]] [[Energy Transfer|energy transferred]] will not all go into one [[Energy Store|store]]. Some will be transferred '''usefully''' and some will be [[Wasted Energy|wasted]].
: '''Useful Energy''' = ([[Total Energy]] transferred) - ([[Wasted Energy]])
: '''Useful energy''' can be used to calculate the [[Energy Efficiency|efficiency]] of an [[Energy Transfer|energy transfer]].