Tuesday, December 1, 2009

Wireless Electricity>>


Marin Soljačić couldn't sleep. The problem was his wife's Nokia cell phone. The tyrannical device beeped on the bedside table when it needed to be plugged in. It could not be disabled.

Instead of taking a hammer to the phone, Soljačić marveled at the fact that this device, and billions of others like it, was sitting a few feet away from all the electricity it could ever need. Why couldn't it receive power wirelessly, just as laptops get Wi-Fi?

A physics professor, Soljačić dug into the problem and learned that if you could get two magnetic fields to resonate -- to sing the same note, in effect -- they could transfer an electric current. With two large magnetic coils, he found a way to throw 60 watts across a room, powering a lightbulb. MIT, his employer, quickly patented the technology and encouraged Soljačićto start a company."
Invisible speakers, guarding man's best friend, psychic video games, an unbreakable e-reader and much more at the link.


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