Efficiency of electric energy to do work is called electric power. If a charge of Q coulomb moves through potential difference of V in time t second, then
Rate of transfer of electric energy through an electric circuit is called electric power.
Consumption of electricity is measured in terms of kilowatt hour
1 unit = 1 kWh = 1000Wh
1kWh = 1000W x 60 x 60s = 3600000Ws
= 3.6 x 106 \(\frac { J }{ s }\) XS = 3.6 x 106J
For example, if a bulb of 1000 W is used for 1 hour then it will consume 1 unit. If a bulb off 100 W is used for 10 hours then it will consume 1 unit.
