Wirelessly Powered Lightbulb (and more!)

<< A Wirelessly Powered Lightbulb

Researchers at MIT have created a revolutionary device that could remotely charge batteries and power household appliances.
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The setup is straightforward, explains Andre Kurs, an MIT graduate student and the lead author of the paper. Two copper helices, with diameters of 60 centimeters, are separated from each other by a distance of about two meters. One is connected to a power source--effectively plugged into a wall--and the other is connected to a lightbulb waiting to be turned on. When the power from the wall is turned on, electricity from the first metal coil creates a magnetic field around that coil. The coil attached to the lightbulb picks up the magnetic field, which in turn creates a current within the second coil, turning on the bulb.

This type of energy transfer is similar to a well-known phenomenon called magnetic inductive coupling, used in power transformers. However, the MIT scheme is somewhat different because it's based on something called resonant coupling.
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For more details: http://www.technologyreview.com/Infotech/17791/



[Follow up of: http://biscottidanesi.blogspot.com/2006/11/charging-mobile-fone-without-cables.html ]