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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