2.16 know and use the relationship between charge, current and time.

Charge = current x time
    Q     =     I      x    t

Example...
A battery charger passes a current of 2.5A over a cell for a period of 4 hours. How much charge does the charger transfer to the cell altogether?

Firstly, cover 4 hours into seconds... 4 x 60 x 60 = 14,400 seconds.

now substitute into the equation...

Charge = 2.5 x 14,400 = 36,000 C (36 kC)

(charge is measured in coulombs, C)



Random fact that we need to know but doesn't really fit anywhere: the bigger the current the bigger the charge