Question

Calculate the no. Of electrons that flow per second to constitute a current of 1a ( )

Answer 1

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.