Today, portable technology is a part of every day life. Having your stereo, telephone or computer tied to a wall is a thing of the past. But almost all portable devices are battery powered, meaning that eventually, they all must be recharged–tying the user back to the wall he was trying to avoid.
Now imagine that instead of plugging in your cell phone, laptop or mp3 player to recharge it, it could receive its power wirelessly–quite literally, “out of thin air”. Sound like science fiction? It’s much closer to reality than you might think.
Wireless power transfer over two-meter distance, from the coil on the left to the coil on
the right, where it powers a 60W light bulb. Members of
the team that performed the experiment are obstructing
the direct line of sight between the coils.
Mutual induction is the production of voltage across a conductor situated in a changing magnetic field or a conductor moving through a stationary magnetic field. This allows for the wireless transmission of electricity over a very close proximity.