Number of electron with a current of 1A
It tells you how many electrons will flow when a current of 1 A is applied for 1 s to a conductor. 1 ampere-second is actually 1 coulomb, the unit to measure charges. Every electron has a charge of -1.602*10^-19 C, so if you divide the charge flowing per second by the elementary charge of an electron, you get the number of electrons flowing per second.