Kill A Watt
Have you always been interested to know how much it costs you to run your computer?
Well here is your answer… just plug this baby in to your wall socket and then plug your PC into the adaptor and your KWH per hour will be shown. Then all you need to do is multiply the cost of one unit of electricity, by the power you’re using and you will get the cost… magic!
It will also show you the exact voltage, line frequency and power factor for all you’re true boffins out there.