the power taken by a pc will vary depending on what part inside is active. If you had the technical skill and equipment you could measure the current taken over a period of time and power is current multiplied by the voltage.
ive just found a site that helps me workout how many kwh i use ... thanks Totally-braindead for your link ...
I have estimated that my computer uses around 276 watts and from what ( no pun intended ) this site says click here
quote :- "Now to understand kWh. The kW part stands for Kilowatt, or 1000 Watts, and the h part stands for hour. That was easy to understanding what kWh means, but how to use it? Let's say we had a 120 watt load (can be 12V,24V or any voltage) and it was running for 10 hours. First you multiply 120 watts by 10 hours, which equals 1200 (watt hours). Then you divide the 1200 by 1000 to get 1.2kWh. This value of kWhs is the value used by power companys to work out the price you need to pay them for power used."
276 for 5 hours (276 x 5 = 1380 watts)
1380watts divided by 1000 = 1.38kwh
my electricity supplier price is 10.91 per kwh so thats .1091 x 1.38 = 15p rounded up ( i think so anyway lol)
I have a plug in power and energy monitor which will tell you the voltage, amperage, wattage, HZ,and kwh of anything plugged into it. You can then work it out depending on the cost of your electricity. Got mine from Maplin for about £16.
Meshuga have you kept records of how many kwh you use per day or do you roughly know how many ? i was looking for a energy monitor through a few sites and they are roughly around £15 not including postage.
It seems like a cool gadget to have. I always thought running a pc was expensive , but with my calculations the base usit(not including monitor/speakers/router ect) is only 30p for 10 hours.I have recently just changed electricity suppliers and running the cost of the comp will decrease over the 10 hours when the contract takes affect lol , 30p i might even get that figure down to 28p haha