Efficiency of machines

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  • Created by: Elca
  • Created on: 09-06-15 20:19

It's really simple to calculate the efficiency...

A machine is a device which turns one type of energy into another. The efficiency of any device is defined as: 

Efficiency = Useful energy OUT / Total energy IN

You might not know the energy inputs and outputs of a machine, but you can still calculate the machine's efficiency as long as you know the power input and output: 

Efficiency = Useful power OUT / Total power IN

You can give efficiency as a decimal or you can multiply your answer by 100 to get a percentage, i.e. 0.75 or 75%. 

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