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Power Without Wires

July 1, 2007
Scientists at the Massachussetts Institute of Technology have demonstrated a technique for transfering power without the use of wires. The team, led by

Scientists at the Massachussetts Institute of Technology have demonstrated a technique for transfering power without the use of wires. The team, led by physicist Marin Soljacic, announced in the journal Science that they had powered a 60W lightbulb wirelessly from a distance of two meters. The idea is not new, as it was promoted by Nikola Tesla in the early 20th century. The problem of controlling electromagnetic energy, which radiates in all directions, has kept the idea from being developed. The MIT team demonstrated that it can be done with 40 percent efficiency over two meters by causing the energy source and the device to resonate at the same frequency. The team thinks they can fine-tune the technology to make it more efficient and commercially viable, calling their technique “WiTricity,” according to a report in the Washington Post.

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