Question

How many electrons flowing per second constitute current of 1 A?

Answer 1

6.242 x 10^28 electrons constitute a current of q ampere

Explanation:

From the formula of current we know that the units of current are ampere. Where

1 ampere = 1 coulumb per second ............ eq (1)

Now, we know that 1 electron is equal to 1.602 × 10-19 coulumbs. So,

1 coulumb = 1/ 1.602 × 10-19 electrons  = 6.242 x 10^28

So, putting value in eq (1). We get,

1 ampere = 6.242 x 10^28 electrons per second

Answer 2

Given:

The current, I = 1 A

To Find:

The no of electrons flowing per second.

Calculation:

- The charge on 1 electron = 1.6 × 10⁻¹⁹ C

⇒ No of electrons in 1 Coulomb charge = 1 / 1.6 × 10⁻¹⁹

⇒ No of electrons in 1 C charge = 0.625 × 10¹⁹

- Charge flowing in 1 Ampere current = 1 Coulomb / second

⇒ No of electrons flowing in 1 Ampere = 0.625 × 10¹⁹ = 6.25 × 10¹⁸

- So, there are 0.625 × 10¹⁹ electrons flowing per second in a current of 1 A.