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===About Efficiency===
: '''Energy 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 [[energy]] out than you put in due to [[Conservation of Energy]].
===Equation===
'' '''Efficiency''' = ([[Useful Energy]] Out)/([[Total Energy]] In)'' <math>Efficiency = \frac{Useful_ Energy_ OutE_{Useful}}{Total_ Energy_ InE_{Total}}</math> Where: E<sub>Useful</sub> = The [[Useful Energy]] [[Energy Transfer|transferred]] to a device's intended purpose. E<sub>Total</sub> = The [[Total Energy]] [[Energy Transfer|transferred]] to a [[system]]. ===References=======AQA==== :[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Energy efficiency, pages 16-19, 21, GCSE Physics; Third Edition, Oxford University Press, AQA ''] ====Edexcel==== :[https://www.amazon.co.uk/gp/product/1292120193/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120193&linkCode=as2&tag=nrjc-21&linkId=572df39392fb4200db8391d98ae6314e ''Energy efficiency, pages 318-319, GCSE Combined Science, Pearson Edexcel '']:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Energy efficiency, pages 36-37, GCSE Physics, Pearson Edexcel '']