Make sure you get the right electricity supply with British Gas, the UK's cheapest electricity supplier on average.
If you want to get an accurate reading of how much energy an appliance is using, then you can do this with your electricity meter and a stopwatch, although you will have to turn everything else in your house off first.
This is not an option most people would be willing to go for, as it is a lot of hassle, and it is usually a good idea to leave appliances such as freezers and fridges on all the time.
A far easier method is to check out the power rating label on your appliance, usually near where the power cable goes in or on the body of an external transformer.
Sometimes the label only gives you the current rating of the device in amps, but you can work out the wattage(which is what mains electricity is measured in by the power companies) by multiplying the number of amps by the number of volts that your power supply uses, which in the UK is 240.
If you are using a DC powered device that requires an external transformer, then you need to multiply the number of amps by the stated DC voltage, rather than the mains voltage, so if it says INPUT 10V, 2A for instance, then the power rating will be ten volts multiplied by two amps, which works out as being twenty watts.
Mains voltages can vary based on a number of factors including the standard of wiring in your house and the state of repair of the local sub station. Although the UK mains voltage is supposed to be 240v, this is really a maximum rating rather than an everyday reality. Appliances that are stated as being set up to work with a 240v supply can actually usually work with a range of voltages between 220 and 240 volts.
However, if you are calculating power usage, then always use the highest rating in this range for your sums, as it is better to over-estimate the power demands of an appliance than under-estimating them, from a safety and economy perspective.
Some devices can work within a huge range of voltages, such as between 100 and 240 Volts, so that it can be used in any country. For your calculations, however, you should just use the standard voltage for your country, which is 240 in the UK.
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