Magnetic inductive-charging pads save the hassle of plugging in your cell phone, camera, MP3 player, or portable GPS unit. Scaled up, this approach could also recharge an electric car’s battery. Both Rolls-Royce and Audi have shown experimental systems in which energy is transferred inductively from a floor pad to a corresponding surface on the bottom of a car. According to Rolls, magnetic inductive recharging is 90-percent efficient and tolerant of alignment errors.
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