Efficiency

Efficiency

### Formula

$$\eta=\frac{Output\ Energy}{Input\ Energy}\times100$$

### Power Form

$$\eta=\frac{P_{out}}{P_{in}}\times100$$

### Terminologies

- η → Efficiency.

- Pout → Output power.

- Pin → Input power.

### Conditions / Special Cases

For real machines:

$$\eta<100\%$$

### Usage

- Used in machine and energy transfer problems.