Is Your Smartphone Charger an Energy Hog?

Modern smartphones' daily charging cycle and ever-nagging battery indicators imply heavy power use. Fortunately, the numbers tell a different story.

A typical smartphone uses about 5 watts of electricity while charging; when the device is plugged in but fully charged, that number drops close to zero. A lithium-ion smartphone battery will take roughly 4 hours to reach a 100 percent charge from empty. Assuming that the phone requires a full recharge every day?most do not?and using the national average electricity price of $0.12 per kilowatt-hour, a smartphone will consume about $0.07 of electricity per month. That's $1.68 over the course of a two-year contract.

In other words, it's probably not worth fretting over. Ditto for your tablet, camera, MP3 player, or camcorder. Even your hungriest gadgets use a tiny fraction of the electricity required by your a/c, heater, or dishwasher.

Source: http://www.popularmechanics.com/technology/how-to/tips/is-charging-a-smartphone-inflating-your-power-bill?src=rss

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