How much charge flow through a light bulb for 3 seconds if the current through the light bulb is 0.75 A?
One way to define an ampere of current is:
A = C/s
Or, 1 ampere = 1 coulomb of electrons pass a given point in a circuit in per second.
A coulomb is ~6,241,509,074,460,762,608 electrons, so .75 amps is ~4,681,131,805,845,571,956 electrons per second passing through the bulb.