17-11-2012, 01:03 PM
A seminar on THE WIRELESS ELECTRICITY
wireless electricity-1.doc (Size: 170 KB / Downloads: 48)
ABSTRACT:
Our forefathers marveled at the invention of glowing light bulbs by Thomas Edison in 1879. However, to us 21st centurions, the light bulb is nothing out of the ordinary. When computers, cell phones, laptops, iPods, etc. were invented our antennas tweaked. Now this is what you call invention! However, as time's progressing we are getting used to these devices. In fact, charging all these appliances has become so very cumbersome Each appliance has its own set of chargers, and with every family member owning their cellphones, the drawers are overflowing with all sorts of wires. How many times have you wished if there could be some way to do away with all the wiry lutter? When you are on the way to work and your cellphone beeps in hunger for a battery harge, haven't you wished for your cellphone attery to get 'self charged'. Well your plight has been heard by doctor 'WiTricity'.
What is WiTricity?
WiTricity is nothing but 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 cell phones, laptops, iPods and 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
What's the Principle behind WiTricity?
WiTricity - Wireless Electricity, these words are simpler said than done. The concept behind this fascinating term is a little complex. However, if you want to understand it, try and picture what I state in the next few lines. Consider two self resonating copper coils of same resonating frequency with a diameter 20 inches each. One copper wire is connected to the power source WiTricity transmitter), while the other copper wire is connected to the device (WiTricity Receiver).
The Brain behind WiTricity?
Prof. Marin soljacicfromMassachusetts Institute of Technology (MIT), is the one who has proved that magnetic coupled resonance can be utilized in order to transfere nergy without wires. What's even more interesting is how he came about this idea. Soljacic, just like any of us was fed up of his 'low battery' beeping cell phone anwondered just like any of us if there was a way to get rid of this 'charging problem'. However, here is where the difference between Soljacic and any of us comes in. He didn't just stand there wondering, instead he tried to figure out if there existed any physical phenomenon which could be of some help. He remembered Michael Faraday's discovery of electromagnetic induction (1831) and used it to come up with WiTricity.
MIT's Experiment:
In 2007, Marin Soljacic led a five member team of researchers at MIT (funded by Army Research Office, National Science foundation and the Department of Energy) and experimentally demonstrated transfer
of electricity without the use of wires. These researchers were able to light a 60W bulb from a source placed seven feet away, with absolutely no physical contact between the bulb and the power source. 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.
Why was WiTricity not developed before?
It is often said 'necessity is the best teacher' and can be applied in this case as well. Only in this century, has the need for wireless electricity emerged so rapidly, spearheaded by the agony caused by the cumbersome charging of endless devices. Earlier people didn't
need it, so they didn't think about it.