Question

2A of current is flowing through a conductor for 5 seconds how many electrons has passed through the cross-section of the conductor.

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Answer 1

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 = 0.5 A and t = 0.2 sec

Therefore,

Q = I*t

Q = 0.5*0.2 = 0.1 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 = 0.1/(1.6*10^-19) = 6.25*10^17 electrons