Though WiTricity uses two coils — one powered, one not, just like eCoupled’s system — it differs radically in the following way: Coils don’t have to be close to each other to transfer energy. Instead, they depend on so-called magnetic resonance. Like acoustical resonance, which allows an opera singer to break a glass across the room by vibrating it with the correct frequency of her voice’s sound waves, magnetic resonance can launch an energetic response in something far away.
Eric Giler wants to untangle our wired lives with cable-free electric power. Here, he covers what this sci-fi tech offers, and demos MIT’s breakthrough version, WiTricity — a near-to-market invention that may soon recharge your cell phone, car, pacemaker.