Question

Assuming that the charges of an electron is 1.6 × 10^-19 coulombs, the number of electrons passing through a section of wire per sec, when the wire carries a current of one ampere is:

Options

• 0.625 × 10¹⁹

• 1.6 × 10^-19

• 1.6 × 10¹⁹

• 0.627 × 10^-17

Answer 1

0.625 × 10¹⁹ 

Explanation:

Charge = q = e = 1.6 × 10^-19 C

Number of electrons = n = ?

Electric current = I = 1A

Time = t = 1S

I = `"q"/"t" = "ne"/"t"`

I = `(1.6xx10^-19xx"n")/1`

`=> "n" = 1/(1.6xx10^-19)`

= 0.625 × 10¹⁹