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A Wirelessly Powered Lightbulb, MIT Technology Rview
 









Excerpts:     Cutting the cord: MIT researchers have shown that it's possible to
wirelessly power a 60-watt lightbulb from two meters away. Above, a coil
(background) creates a magnetic field that is able to pass through an
obstruction. The foreground coil resonates at the frequency of the magnetic
field, picking up its energy to power the bulb. Credit: Science      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.
Transformer coils can only transfer power when they are centimeters apart--any
farther, and the magnetic fields don't affect each other in the same way. In
order for the MIT researchers to achieve the range of two meters, explains
Solja?i?, they used coils that resonate at a frequency of 10 megahertz.
Source: A Wirelessly Powered Lightbulb[
http://www.technologyreview.com/Energy/18836/ ], Kate Greene, MIT Technology
Rview, 07/06/08

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