B&Q, Homebase and a well known large electrical chain all sell plug in energy monitors. They plug into the socket and you then plug in the pc or any appliance to that and it will tell you how many watts, amps,, voltage, kwh and hz that the pc or appliance uses. Cost's between £9 and £20 depending on where you go. I have one and they are very good. I know exactly how much everything in this house uses now because i am a tight git.
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