If a 200w electric radiator is on for 5 hours and uses 1kWh of electricity, it will cost 12.5 pence to run. 0.2 kilowatts x 5 hours is 1kWh. If a 1000w electric radiator is on for 5 hours, it will use 5kWh of electricity, so it will cost 62.50 pence to run.
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