Goodbye power cord; You will not be missed.

A group of researchers at MIT have made yet another breakthrough in wireless power. By imbedding a large copper coil in a wall or ceiling and using electromagnetic resonance to transfer power between multiple devices, physicists André Kurs, Robert Moffatt, and Marin Soljačić have managed to generate fairly high efficiency by strategically coupling multiple devices as opposed to a single device. When the devices resonate at the same frequency, power is transferred with little interference by other objects resonating out of that frequency. Efficiency decreases with distance, but the system works from more than 2 meters away.

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"Experimentally, the scientists showed that the system could supply more than 25 watts of power to each of two electronic devices located two meters or more from the source coil. In addition, the researchers found that powering multiple devices simultaneously could increase the overall efficiency. For example, the system could achieve power efficiencies greater than 50% for multiple devices, whereas the power efficiency for a single device was less than 20%. Having multiple devices increases the coupling resonance, which leads to greater efficiency."

Plug into the whole story here, courtesy of Physorg.