Efficiency

Efficiency

The efficiency of an energy transfer is a unitless number that describes the proportion of energy that is transferred to a useful form. It can be written as a decimal or a percentage.
Efficiency can be calculated as useful output energy ÷ total input energy
Efficiency can also be calculated as useful output power ÷ total input power
Efficiency can be increased by reducing energy losses.
- Reducing the effects of friction through lubrication, reducing heat loss through insulation or reducing the effects of air resistance through streamlining will reduce the energy dissipated to the surroundings.

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