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A machine whose input energy is electrical. e.g. a kettle
energy transferred per time.
1 joule / second
1000 joules / second
P x t
The energy supplied to a 1kW appliance during 1 hour.
total cost =
number of kWh used x cost per kWh
The time it takes to make savings that equal the total cost of installing an energy-saving measure such as double glazing.