A system that can deliver power to devices without the need for wires has been shown off at a hi-tech conference....wow!

The system is based on work by physicist Marin Soljacic at the Massachusetts Institute of Technology (MIT). It exploits "resonance", whereby energy transfer is markedly more efficient when a certain frequency is applied. When two objects have the same resonant frequency, they exchange energy strongly without having an effect on other, surrounding objects.

For example, it is resonance that can cause a wine glass to explode when a singer hits exactly the right tone. But instead of using acoustic resonance, Witricity's approach exploits the resonance of low frequency electromagnetic waves.

Full Story Here