Drift Velocity

📊 advanced

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

Average velocity attained by electrons in a conductor due to an electric field.

Variables & Units

$v_d$

Drift Velocity

Unit: $m/s$

$\tau$

Relaxation time

Unit: Second

Key Information

📐 Derived From

Newton's Second Law and mean free path.

💡 Example

Explaining why current flows near light speed despite slow electron drift.

🔧 Applications

Semiconductor physics.

⚠️ Constraints

Valid for ohmic conductors.

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