Drift Velocity

Drift Velocity

### Formula

$$v_d=\frac{I}{neA}$$

### Relation with Electric Field

$$v_d=\frac{eE\tau}{m}$$

### Terminologies

- vd → Drift velocity.

- E → Electric field.

- τ → Relaxation time.

- m → Mass of electron.

### Conditions / Special Cases

- Drift velocity is very small compared to random velocity.

### Usage

- Used in conductor current calculations.