Drift Velocity Class 12th Current Electricity

Drift Velocity Class 12 | Current Electricity | KK Education

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In this video, we'll explore the concept of drift velocity, a crucial topic in Class 12 Physics, Chapter 2: Current Electricity.

What is Drift Velocity?
Drift velocity is the average velocity of free electrons in a conductor when an electric field is applied. It's the velocity at which electrons drift towards the positive terminal of the battery.

Key Points:

Drift velocity is directly proportional to the electric field strength.
It's inversely proportional to the mass of the electron and the relaxation time.
Drift velocity is typically very small, on the order of 10^-4 m/s.

Formula:
The drift velocity (v_d) is given by:
$$v_d = \frac{eE\tau}{m}$$
where e is the charge of an electron, E is the electric field, τ is the relaxation time, and m is the mass of an electron.

Importance of Drift Velocity:
Understanding drift velocity helps us grasp how electric current flows through conductors and is crucial for understanding Ohm's law, resistivity, and conductivity.

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