From the last issue of The Economist (Edited by me): "..a company called Wibotic that plans to recharge drones (and also earthbound robots) without them having

From the last issue of The Economist (Edited by me): "..a company called Wibotic that plans to recharge drones (and also earthbound robots) without them having to establish an awkward physical connection with a plug.... LaserMotive, another Seattle-based company, .. is developing a system designed to replenish the batteries of drones that are still aloft, using lasers and photovoltaic cells.. Wibotic’s answer is to use tuned electrical circuits in place of simple transmitting and receiving coils. When such circuits are tuned to the same resonan"t frequency, they exchange energy more efficiently. That permits power to be transferred over distances up to the diameter of the coils, or even slightly farther." Reference : http://www.economist.com/news/science-and-technology/21656134-electronics-has-already-cut-data-cord-can-it-now-cut-power-cord http://www.economist.com/news/science-and-technology/2165613...