4.1.2.2 Efficiency

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Physics

9th

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Efficiency
The less wasted energy the more efficient the device is
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Efficiency equation
ef ficiency = useful output energy transfer/ total in put energ y trans f er

ef ficiency = useful power output/ total power input
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The efficiency of a system can be increased by
Reducing waste output (lubrication, thermal insulation)

Recycling waste (absorbing thermal waste and recycling as input energy)
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Useful devices
Transfer energy from one store to another

No device is 100% efficient as energy is dissipated
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