The cost of electricity is measured by multiplying the energy used (In Watts) by how long it is used for (in hours), this is termed Kilowatt-hours or kWh for short. You the consumer is then charged per kWh of electricity you use. Often this is around 12-15 pence per unit but can be more or less depending on how good or bad a deal you have with your energy supplier.

This could be a 1kW electric bar heater on for 1 hour or a 100W lamp on for 10 hours or a 5W lamp on for 200 hours etc etc

Obviously the lower the wattage the longer the ‘device’ can be on for, for your money.


~ by futurelamps on December 21, 2012.

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