Sony has developed a prototype of power system that can power a television set wirelessly over a short distance. The company sent a 100 volt electricity supply to power a 22-inch LCD television which is at a distance of 50 centimeters.
This feat is achieved through the technology called magnetic resonance, in which a magnetic field is used to transfer the energy between two coils. The power is supplied to a square coil, known as primary coil, to produce a magnetic field. If the secondry coil is with in the magnetic field it produces a current induced in it. The two coils are tuned to same resonant frequencies and energy can be moved safely. It is not necessary that the two coils should be aligned, it can transfer energy even when the two coils are not aligned.
But there are some draw backs for this sysytem. The distance and the system efficency are the major problems. This prototype system is only 80 percent efficient. This is only a demonstration and Sony is expecting to start commercial production at the earliest.
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