Light Bulb Glows Without Wires

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June 8, 2007

CAMBRIDGE, Mass. -- How many power cords does it take for Massachusetts Institute of Technology researchers to make a light bulb glow? Answer none.

They've come up with a way to make a 60-watt bulb glow by sending energy wirelessly from a device across the room.

The breakthrough was published in the online version of the journal Science. The scientists have dubbed their finding WiTricity.

It's not a new concept, but scientists had dismissed wireless juice as inefficient because energy generated by charging devices radiates in all directions.

But leave it to an MIT physics professor to make it work.

Researchers used specially tuned waves that radiate less to send the energy.

The key is to get the recharging device and the gadget that needs power on the same frequency, similar to how a radio picks up only one station at a time.