Question

how to calculate number of electron in one coulomb charge

Answer 1

The charge on an electron is negative and it is -1.6⨯10-19 coulomb therefore, 1 C charge is carried by 1/ (-1.6⨯10-19) = 6.25 ⨯ 1018 electrons. Hence if 1 A current flows through a conductor, it implies that
6.25 ⨯ 1018 electrons pass per a second across the cross section of the conductor.
In more simpler words, We know that the a electron have charge of 1.6 × 10−19 C∴ e =1.6 × 10−19 CTotal charge required 1Coulomb.∴ q = 1CSince q=ne⇒ n =q/e⇒ n =  1/1.6 × 10−19⇒6.25×1018⇒6×1018 electrons.Hope it helps! ^^

Answer 2

The charge on an electron is negative and it is -1.6⨯10-19 coulomb therefore, 1 C charge is carried by 1/ (-1.6⨯10-19) = 6.25 ⨯ 1018 electrons. Hence if 1 A current flows through a conductor, it implies that
6.25 ⨯ 1018 electrons pass per a second across the cross section of the conductor.