Question

answer plz...................
an electric current of 1 A is passing through a cross section of the coil in 1 second .How many electrons are involved in providing a current of 1 A? the charge on 1 electron is 1.602×10^_19 C

Answer 1

Since I = 1A and we are interested when t = 1 second. Therefore

Q = 1⋅1 = 1C

We know that the charge of 1 electron has the magnitude 1.6 x 10^(-19) C. Therefore we are looking for the solution to this equation

Number of electrons x 1.6 x 10 − 19 = 1C

= 6.25 x 1018

Answer 2

As-salamu alaykum!

One ampere of current is flowing when one coulomb of electrons passes through the material in one second.

⇒ if we know how many electrons make up a coulomb we can easily define how many electrons are providing a current of 1 A.

we know that electric charge of an electron is = -1.6 × 10⁻¹⁹ Coulomb.

⇒ 1 Coulomb = (e)/(-1.6 × 10⁻¹⁹) = -6.25 × 10¹⁸ electrons.

negative sign denotes that the charge on electron is negative

⇒ one dozen contains 12 items

⇒ in the similar way one coulomb contains 6.25 × 10¹⁸ electrons

but one ampere is one coulomb of electrons passing in one second

⇒ one ampere of current is flowing when 6.25 × 10¹⁸ electrons are passing through the material in one second. (It is indeed a huge rush of electrons!. . .can't imagine the electron's traffic problems)