If a current of 2 A flows through a cross section for 5 seconds, what is the number of electrons that have passed through the cross section?

6.25  0.625 x 1020  6.25 x 1018 10-18

0.625 x 1020

I = Ne/t N = tI/e I = 2 A ; t = 5 s ; e = 1.6 x 10-19 C N = 0.625 x 1020