Charging An E.V., Sans Wires

FOR a company trying to put wireless charging devices on electric cars, road trips can be interesting. WiTricity is the company, based near Boston, that has partnerships with Audi, Mitsubishi and Toyota to put wireless charging on electric cars, possibly as early as the 2015 model year. WiTricity licenses technology, developed at M.I.T., to transfer power between a pair of copper coils resonating at the same electromagnetic frequency.