How much power is consumed when an appliance is in "sleep" mode

Hi guys

I'm doing a project where I need to make a power usage graph containing Watt ratings of every appliance in my house. What I'm trying to figure out is how much power an appliance uses when it is not fully functional eg. When a radio is off but its clock is on or when a computer is in sleep mode.

Also (just an aside question) is it safe to assume when working on a computer - the power supply is running at its full power rating?

Does anyone know any Website that will explain this or even a search string that I can use in an engine that will get a valid result?

Thanks in advance

You need to measure this; I doubt you can find accurate data on this. Most standby modes are less than 5W - but there are power meters that can help you measure the moment to moment power consumption.

And no, a computer will usually NOT max out its power supply. I have a 1000W power supply on my computer, for instance, and I'd be very surprised if I managed to draw more than 700W with EVERYTHING in my computer running at full blast.

Something like this (UK standard, as far as I can tell) is what you're looking for: http://www.amazon.co.uk/Plug-In-Power-an…