Physics
Efficiency
Ratio of useful output to input energy.
Formula
Formula
η = outputinput · 100
Variables
| Symbol | Definition | Type & range | Units | Role |
|---|---|---|---|---|
| output | useful energy out | 0 ≤ output ≤ input | J | result |
| input | energy supplied | input > 0 | J | result |
| η | efficiency | 0 ≤ η ≤ 100 | % | result |
Try it yourself
Interactive calculator
Worked examples
Example 1
Givenuseful output = 750, energy input = 1000
Result75
Example 2
Givenuseful output = 40, energy input = 100
Result40