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I'm not sure what they use but it's an amount. I think when considering that you need to look at the overall picture of how many other things in your home are doing the same thing. When you add them together it's a significant amount.
For example how many clocks do you have in your kitchen? I can look around my kitchen and tell you the time from nearly any point of view. It glows green at night and none of them have a damn switch to turn them off either. Other things that might consume power are most of your electronics like DVD players, TV's... I installed a analog converter on one TV in my house and the damn thing has big light to tell me it's off .
All these things add up to lot of wasted energy especially when you consider nearly every household has the same issue.
Especially the "wall warts" that feel hot to the touch - generally they are a couple of watts. So any ONE wall wart doesn't draw much, but how many do you have? Between my laptops, cell phones, printers, monitors, FAX machine and other devices, I probably have 15 or 20. I try to keep them all on one power strip that I can actually shut off.
The point is not so much that they waste a lot of energy than it is that they are a COMPLETE waste of energy when they are just sitting there, not doing anything.
My Blackberry charger uses about 3 watts when charging. Depending upon it's internal circuitry, it might use 3-10% of that when not charging but plugged into the wall. That's 1-3 kwh per year, 10-30 ¢ depending upon your prices.
Oh my gosh, I never thought my charger is using electric when it is plugged in but NOT plugged into my phone. Learn something new every day.
Most desktop computers use 5-10 watts when "shut down" since they have a standby power that runs, unless you flip the switch on the power supply itself or cut the AC with a power strip.
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