A current of 5.0 a flows through an electrical device for 10 seconds. how many electrons flow through this device during this time?

1 Amp = 1 Coulomb/sec

1 Coulomb/sec = 6.25*10^18 electrons/sec

Therefore,

5.0 A = 5 C/s = 5*6.25*10^18 = 3.125*10^19 e/s

In 10 second, number of electrons are calculated as;

Number of electrons through the device = 3.125*10^19*10 = 3.125*10^20 electrons