Question

Explain the electric current on the basis on free electron

Answer 1

Hey friend
here is your answer
if "n" no. of electrons pass through the cross section of a conductor in time "t" , then the total charge passed through the conductor is given as;
$q = n \times e \\ and \: current \: in \: a \: conductor \: is : \\ i = \frac{q}{t} = \frac{n \times e}{t}$
so, that's your answer.

glad to help you
hope it helps
thank you.

Answer 2

when free electron passes from one potential to other