Electrical engineers measure electrical energy in kilowatt-hours. One kilowatt-hour, which is the same as 1000 watt-hours, is sufficient energy to power a one-kilowatt appliance by cable wire for one hour.
The energy of 1 kilowatt-hour may be consumed by an appliance that takes 1000 watts running for 1 hour, or an appliance that takes 1 watt running for 1000 hours, or an appliance that takes 100 watts running for 10 hours, or anything in between so long as the time multiplied by the power comes to 1000.
The electricity bill does not distinguish between high-power and low-power appliances, only the total energy.
You will normally be charged a certain amount for each kilowatt-hour of energy, plus a certain fixed amount, on each bill.
Many supply companies are now offering charging schemes that remove the fixed amount (standing charge) which is good news for people who are careful with electricity4.
Here's an example. Suppose your supply company charges 10 pence per kilowatt hour.
How much does it cost to run a 40-amp electric shower for half an hour? Since power is voltage times current, the shower will consume 40 x 230 watts.
That's 9200 watts or 9.2 kilowatts. So it would cost 9.2 times ten pence to run it for one hour, or half that for half an hour. So the total cost is (1/2) x 9.2 x 10 pence, or 46 pence.
This is about the same price as running a 100-watt lightbulb for two days.
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