Question

The charge on an electron is 1.6×10^-19 C .Find the number of electrons that will flow per second to constitute a current of 2A.​

Answer 1

Explanation:

Current is the amount of charge passing through a conductor in a particular interval of time.

So according to the definition, the formula for the current is:

I = Q/t

I = 2 A and t = 1 sec

Therefore,

Q = I*t

Q = 2*1 = 2 C

One electon consists of a charge of 1.6*10^-19 C. Then the number of electrons passing would be:

Q = n*e

n = Q/e

n = 2/(1.6*10^-19) = 1.25*10^19 electrons

Answer 2

Current, I=2A

Time, t=1sec

Number of electron=n

The Charge on an electron, e=1.6×10^-19

We know that

Thus, I=Q/t

I=n×e/t [ Q = n×e]

2=n×1.6×10^-19/1

n= 2/1.6×10^-19

n=1.25×10^19