Question

derive i=neAVd where symbols has unusual meaning

Answer 1

Let the length of conductor is l and area of cross section is A and number of free electron per unit volume is n then         Total no. Of electron in whole volume of conductor = nAl  Total amount of charge of free electron in whole volume of conductor  = nAle=q Time taken by free electron in travelling from negative end to positive end is t =l÷Vd Therefore electric current passing through conductor = nAleVd÷l I = neAVd