WiTricity is nothing but a name given to wireless electricity. Transmission of electrical energy from one object to another without the use of wires is called as WiTricity. WiTricity will ensure that the cellphones, laptops, iPods and all other power hungry devices get charged on their own, eliminating the need of plugging them in. Even better, because of WiTricity some of the devices won’t require batteries to operate.
Well lets see a brief introduction to its inventor and then to the working part:
Invented by Nikola Tesla(1856 – 1943)
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The idea of wireless electricity has been around since the early days of the Tesla coil.Tesla invented the alternating-current generator that provides your light and electricity, the transformer through which it is sent, and even the high voltage coil of your picture tube. The Tesla Coil, in fact, is used in radios, television sets, and a wide range of other electronic equipment – invented in 1891, no-one’s ever come up with anything better.
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Then the initiate was taken by the group of MIT scientists, “WiTricity” (as these scientists call it).They demonstrated the ability to power a 60-watt light bulb from a power source seven feet away without wires might not seem like the most impressive of feats, but the technology behind it has massive implications for how we live our tech-filled, power-hungry lives.The first copper coil (24 inches in diameter) was connected to the
power source and the second was connected to the bulb, and were
made to resonate at a frequency of 10 MHz. The bulb glowed even
when different objects (like a wooden panel) were placed between
the two coils. The system worked with 40% efficiency and the power
that wasn’t utilized remained in the vicinity of the transmitter itself,
and did not radiate to the surrounding environment.
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WORKING:
The basic principle behind the “witricity” is “RESONANCE COUPLING”.The electric power from the power source causes the copper coil
connected to it to start oscillating at a particular (MHz) frequency.
Subsequently, the space around the copper coil gets filled with nonmagnetic
radiations. This generated magnetic field further transfers
the power to the other copper coil connected to the receiver. Since
this coil is also of the same frequency, it starts oscillating at the same
frequency as the first coil.Which is the “coupled resonance”.
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Engineer's World 