The coulomb is the unit of electric charge, and it is the charged particles which flow when electricity is said to flow. The coulomb is a very large amount of charge and so the charge of an electron is very small.

e- = -1.6e-19 C

When one coulomb of charge flows past a point in one second, a current of one ampere is said to have flowed.

the equation linking charge, current, and time is:
q=It (Charge = Current x Time)