2.6 use the relationship between energy transferred, current, voltage and time

energy transferred = current × voltage × time
E = I × V × t
The power of an appliance (P) tells you how much energy it converts each second. This means that the total energy (E) converted by an appliances is equal to its power multiplied by the length of time the appliance is being used.

Total energy, E(in joules) = power, P (in watts) x time, t (in seconds)
E= P x t
Since, P = I x V
E= I x V x t