Equations
Efficiency
Energy · id efficiency
\eta = \frac{W_{out}}{W_{in}}
| Symbol | Quantity | Unit | Meaning | Usual range |
|---|---|---|---|---|
eta | efficiency | dimensionless | Fraction of input energy turned into useful output | 0.01 to 1 |
Wout | useful energy out | J | Useful work or energy delivered | 0 to 1e+12 |
Win | energy in | J | Energy supplied | 0 to 1e+12 |
Assumptions
- Energies measured over the same interval
Valid when
- No extra conditions.
Found by
Questions with these words retrieve this equation: efficiency, useful energy, wasted energy, motor, engine, percent efficient.
Source
OpenStax University Physics Volume 1, Chapter 7 (reference; entry written by the project). License: MIT. Entry confidence: 0.98.