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witricity pdf
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Post: #3
WiTricity



.pptx  WiTricity.pptx (Size: 2.1 MB / Downloads: 107)

What do you mean by WiTricity!!!

The Transfer of Electricity from one place to another without wires is known as “WiTricity”.
On June 7 ’07, a team of researchers at MIT announced the successful operation of WiTricity concept.
They had lit up a 60W bulb with a power source at a distance of 7 feet(over 2m) with no wires.

The Brain behind WiTricity?

Prof. Marin Soljacic from Massachusetts Institute of Technology (MIT) is the one who has proved that magnetic coupled resonance can be utilized in order to transfer energy 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 and wondered 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.

Short Range Wireless Energy Transmission: Inductive Coupling

What Is Inductive Coupling?
Inductive Coupling is a method for short range wireless energy transfer.
Its range can vary, but it’s often very short.
Because of its short range it usually is used when the device containing the receiver and the device containing the transmitter are touching.

How does Inductive Coupling Work?

Inductive coupling works on the principles of electromagnetism:
When a current (electricity) passes through a wire, it generates a magnetic field perpendicular to the wire.
This effect can be magnified through coiling the wire.
When a wire is in proximity to a magnetic field, it generates a current in that wire.
Transferring energy between wires through magnetic fields is inductive coupling.
Magnetic fields decay quickly, making inductive coupling effective only at very short ranges.

How does Resonant Induction Work?

Resonant induction still uses the same principles as magnetic induction (magnetic fields to transfer current), but it uses resonance to increase the range at which the transfer can efficiently take place.
“Resonance", a phenomenon that causes an object to vibrate when energy of a certain frequency is applied.
Everything resonates at a certain frequency, based on its shape and material.
Energy transfers easily between resonating objects. An example of this is when an opera singer shatters wine glasses by singing at the frequency at which the glasses resonate.
With resonant induction, power is transmitted between two resonating coils.
 

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