A new car battery costs a lot of money, partly because of the electrical energy stored ... So a 1 kW electric fire will use 5 kWh in 5 hours but a 100 W light bulb will ... Calculate the cost of running a 2 kW grill for 20 minutes ... energy is used by a 150 W black and white television if is left on for 4 hours? ... 2 kW kettle, 5 minutes.
