wireless power

A U.S. research team reports moving closer to wireless power transfer by lighting a 60-watt light bulb from a power source located seven feet away.The Massachusetts Institute of Technology team called their accomplishment 'WiTricity.Although various methods of transmitting power wirelessly have long been known -- think of radio waves -- they are not feasible to use for power transmission.In contrast, WiTricity is based on using coupled resonant objects, in which two resonant objects of the same resonant frequency tend to exchange energy efficiently, while interacting weakly with extraneous off-resonant objects.