Looking at this post at treehugger about this very subject I see these comments:
FWIW, following this post I went and hooked up my "Kill-A-Watt" monitor to my cell phone charger. The results are in: 0.04 kWh over 308 hours. That is, I left the charger plugged in for 308 hours, and attached my phone whenever it got low.Math makes my head hurt so I'll stop with the numbers. The point is, it's a lot of wasted energy and a lot of Carbon being pumped into the atmosphere to power unused devices. Via CNN there is this:
At that rate my total kWh for the year is going to be 1.1
I understand that there are a lot of "bad" adapters out there, but maybe they are the big, heavy, hot things attached to cheap computer equipment. I saved an 8 watt continuous pull by dropping my powered computer speakers, for instance.
okay, so it's "only" 1.1 kwH per year. that's for one charger for one cell phone. let's extrapolate: the population of canada is 32 million. sure, not everyone has a cell phone, but there are a LOT of ppl with two, three, or more of the things. if everybody wastes "only" 1.1 kwh per year, do the math: 32.3 MILLION kilowatt hours wasted per year!
i just did the math:
one barrel of oil = 1640.8KWh
therefore, if 32 million cell phone charger adapters were left plugged in and wasting 1.1 KWh/year, that's
196,977.08 barrels of oil wasted!
Keeping your cell phone and battery charger plugged in may cost you $1.50 a month and the night light? That'll cost you $.50 a month if you keep it on 24/7. On a national scale, the Alliance to Save Energy estimates that on a national level, these vampire devices use about 5 percent of our energy and cost consumers more than $8 billion annually.Best of all is this page at the U.S. Department of Energy's Energy Efficiency and Renewable Energy which details the power usage of all sorts of home appliances.