Relation Between Drift Velocity and Electric Current

Chapter-3|Current Electricity| NCERT 12th Physics:
 

Relation Between Drift Velocity and Electric Current:

We consider a conductor of length l and A be the uniform area of cross-section.

Volume of conductor V= Al

If n be the number of free electron per unit volume, then

Total number of free electron in conductor= nAl

If e is the charge of an electron, then the total charge of all electron in conductor

q= nAle           -(I)

Time taken by the free electron to cross the length l of the conductor

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