How many kWh does an average running desktop computer take?

First let me define what is a KWh. If a machine consume 1000 watt and we use it for one hour it will consume one KWh, thousand watt consumption for one hour. An average Desktop Computer with 17 Inch CRT Monitor takes Roughly 300 watts means that continuous use of 3 hours consumes one KWh. If you are using a LCD Monitor then you can save lot of power. One KWh can run a Desktop for roughly 6 Hours.