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Spec for Wireless Charging to Be Set Within 6 Months

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Jan 11, 2010, 8:40 PM
Is using a touchstone-like system any more or less power efficient than a regular charger? We already waste too much electricity by keeping electronics plugged in longer than needed and I am curious if more energy is lost by using this system. If so, we should rethink our priorities.

Jan 12, 2010, 1:32 AM
As "cool" as charging mats are conceptually, they are a ridiculous source of power waste. These things are terrible.

A little science: everyone knows that electricity and magnetism are almost the same thing, and it's fairly easy (thought ridiculously inefficient) to turn magnetism into electricity and the reverse process, but every time this transformation occurs, a tremendous amount of energy is lost.

To charge a small electric device out of a wall socket with a regular charger, the electricity travels through a circuit board that changes the current from AC into DC and then uses some extra resistance to step down the voltage from 120V down to about 10V (my BlackBerry charges at 5V, my electric razor at 12V), while this is pretty e...

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