Tesla's dream of wireless power transmission on display

A Haier HDTV sits on top of a clear plastic stand, playing a movie from a Blu-ray player. Except as you walk around the display, you realize the HDTV is not connected to anything, not to the Blu-ray player and especially not to a power source.

Nikola Tesla believed he could broadcast power over the air. A company called WiTricity, founded by an MIT professor, is getting close to accomplishing it. A foot or so behind the HDTV is a black monolith. Inside the monolith, and inside the Haier HDTV, are matching coils resonating at 240 KHz . Using highly-coupled magnetic resonance, the coil in the black monolith wireless transfers power to the HDTV at about 80 percent the efficiency of wired AC.

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