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Wireless Electricity = WiTricity

MIT Wireless Electricity
Though it's too early to throw out our AC adapters and powerstrips, a team at MIT has taken us one step closer to a wire-free existence by managing to power a 60 Watt lightbulb from seven feet away without any cords! WiTricity, as the technology is being called, uses the simple physics of resonance.

Resonance causes an object to vibrate when energy at a certain frequency is applied. This is similar to the premise behind the old shattering wine glass gag. If a glass resonates at the same frequency as the singers voice, it will vibrate and shatter once enough pressure has built up. In the case of WiTricity, a charging device sends out low-frequency electromagnetic waves to a gadget. If those waves and the gadget to be powered resonate at the same frequency, presto, you've got wireless electricity. Of course, it's not that simple, but that's the gist anyway.

This technology has the potential to power a roomful of gadgets and appliances with just wireless charging device. It can even work through obstacles, including walls. The next step for the group is to shrink the technology down since the current copper coils used for demonstrations are two feet wide.

And before the paranoid technophobes out there start beating their drum again, let it be known that there is no danger to humans from this technology. The field is almost entirely magnetic and the human body doesn't respond to magnetic fields.

From USA Today and BBC

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