There is one kilowatt in a unit of electricity. This refers to one kilowatt-hour or kWh. One kWh refers to the total energy that is used by a 1kW rated electrical device for an hour.
Electricity is normally sold in units of electricity or kWh. Each electrical device has its own power rating. For example, an immersion heater has a power rating of 3000W while a freeze has a power rating of 150W. Power refers to the energy consumption rate and is measured in watt or W. One kilowatt is equivalent to 1000W.
By identifying the electrical devices that consume the most energy at a person's home and controlling energy consumption, one can reduce the amount of money spent on units of electricity, which are shown on the utility bill.