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What is drift velocity of free electrons...

What is drift velocity of free electrons ? Deduce `I = n A eV_(d)` where the symbols have their usual meaning.

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The average velocity with which free electrons move or drift under the infliuence of electric field.

l= length of the conductor
A = area of cross section
n = number of free electrons/unit volume
e = charge of the electron
Total charge `q = n A el`
Drift velocity `V |_(d) =l/t or t = (l)/(V_(d))`
`I = (q)/(t)`
`I = ( n A el)/((l)/(V _(d))) = n A eV _(d)=l`
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