Energy is measured in Joules ( J ). This unit is used for all forms of energy.
The energy supplied to a machine is called the input energy.
Input energy = useful energy output + wasted energy
Efficiency = useful energy output / total energy input
Efficiency can be left as a fraction or multiplied by 100 to give a percentage.
The energy transfer through an appliance can be shown in a sankey diagram.
As efficiency is a ratio it does not need a unit.
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