Question

how many electrons pass through a wire in one minute if the current passing through a wire is 200 amphere

Answer 1

Given
Amount of current passed = 200 A
Time the current passed  = 1 min = 60 s
The charge of one electron = 1.6 * 10^-19

Current = number of electrons * charge of  one electrons/time
200 A = number of electrons * 1.6*10^-19/60
200 * 60/1.6 * 10^-19 = number of elctrons
On solving we get 
Number of electrons = 7.5 * 10^22

Hope this helps you.