3.3 Using electrical energy

Using electrical energy

The kilowatt-hour is the energy transferred/ supplied  to a 1kW appliance in 1 hour.

E=P x t

E = energy transferred in kilowatt-hours, kWh

P = power of appliance

t = time taken (in hours) for energy to be transferred

Cost of electrical energy supplied is found using the equation:

Total cost= number of kWh used x cost per kWh