Question

calculate the number of electron passing per second through a conductor to produce a current of one ampere.

Answer 1

  By using formula :   Q= I/t

 We know that: Q = ne

Combining above two equations, we get

                      ne = I/t

  Putting values

                   n x 1.6 x 10^-19 = 1/1

                        n = 1/ 1.6 x 10^-19

    Hence, No. of electrons = n = 6.25 x 10^18 electrons

Answer 2

1 Ampere = 1 Coulomb / Second

Charge on 1 electron = 1.6 x 10^-19 Coulomb

By unitary method,

If 1.6 x 10^-19 Coulomb / Second (Ampere) = Current by 1 electron

then,

1 Coulomb / Second (Ampere) = 1 / (1.6 x 10^-19) electrons

,i.e, 6.25 x 10^18 electrons.