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What is Drift Velocity?

+7 votes
asked May 24, 2016 in Physics by vikash (21,277 points) 4 18 65

I want to understand Drift Velocity.

1 Answer

+2 votes
answered May 24, 2016 by sarthaks (25,068 points) 8 21 33
selected May 24, 2016 by vikash
Best answer

The drift velocity is the flow velocity that a particle, such as an electron, attains in a material due to an electric field. It can also be referred to as axial drift velocity. In general, an electron will propagate randomly in a conductor at the Fermi velocity. An applied electric field will give this random motion a small net flow velocity in one direction.

In a semiconductor, the two main carrier scattering mechanisms are ionized impurity scattering and lattice scattering.

Because current is proportional to drift velocity, which in a resistive material is, in turn, proportional to the magnitude of an external electric field, Ohm's law can be explained in terms of drift velocity.

The most elementary expression of Ohm's law is:

u= \mu E ,
where u is the drift velocity, μ is the electron mobility (with units m2/(V⋅s)) of the material and E is the electric field (with units V/m).

commented May 25, 2016 by vikash (21,277 points) 4 18 65
Awesome Answer!

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