1. WIRELESS ELECTRICITY
PREPARED BY : ARYA LEXMI
ROLL NO. 17
S5 , ELECTRONICS

2. Outline
Introduction
What is WiTricity ?
Background
Technique to transfer
How wireless power works
Features &benefits
Advantages
Is WiTricity secure ?
Safety concerns
Range of WiTricity
Ridiculous technology
Usage Areas
Future of WiTricity
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3. Normally, we picture
electric devices with wires.
For example, laptop, cell
phone, lamp etc.
Remember every time you
travel or at home, you need
to pack all the adapters
and chargers for your
devices. It’s unpractical,
isn’t it. The solution is near.

4. What is Wi-Tricity ?
Transmission of energy through the air.
Process of transferring electric energy or power over
distance without wires.
Wi-Tricity, a portmanteau for "wireless electricity", is a trademark
of WiTricity corporation referring to their devices and processes
which use a form of wireless energy transfer including resonant
energy transfer etc., the ability to provide electrical energy to
remote objects without wires using oscillating magnetic fields.
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5. Background
Nikola Tesla – The Genius
He did enlighten 200 lamps
at the distance of 40 km,
Wirelessly !
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6. Prof. Soljacic – Another Genius
MIT-IBM Collaboration
He did succeed to redesign
Tesla’s experiment in safer way.
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7. Technique To Transfer
One Simple Physics Rule !
At Source : Electricity => Magnetic Wave
At Device : Magnetic Wave => Electricity
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8. HOW WIRELESS POWER WORKS
 1. Magnetic coil (Antenna A) is housed
in a box and can be set in wall or
ceiling.
 2. Antenna A, powered by mains,
resonates at a specific frequency.
 3. Electromagnetic waves transmitted
through the air.
 4. Second magnetic coil (Antenna B)
fitted in laptop/TV etc resonates at
same frequency as first coil and
absorbs energy.
 5. Energy charges the device.
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9. 9

10. FEATURES & BENEFITS
WITRICITY’S TECHNOLOGY TECHNOLOGY BENEFIT
 Highly Resonant Strong Coupling High Efficiency over Distance
 Energy Transfer via Magnetic Near Field Penetrates and Wraps-
Around Obstacles
 Non-Radiative Energy Transfer Safe for People and
Animals
 Scalable Design From Milliwatts to Kilowatts
 Flexible Geometry Devices That Can Fit Into
OEM Products
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11. Advantages
Getting rid of great deal
of cables !
More secure, no risk of
getting shocked.
Places where you can
not have physical cable,
solution WiTricity
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12. WiTricity technology will make products:
 More Convenient:
 No manual recharging or changing batteries.
 Eliminate unsightly, unwieldy and costly power cords.
 More Reliable:
 Never run out of battery power.
 Reduce product failure rates by fixing the ‘weakest link’: flexing wiring
and mechanical interconnects.
 More Environmentally Friendly:
 Reduce use of disposable batteries.
 Use efficient electric ‘grid power’ directly instead of inefficient battery
charging.
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13. Is WiTricity Secure ?
Yes it is secure !
Principle of witricity is
based on oscillating
Magnetic fields.
We too live in a globe
that is already
surrounded by magnetic
waves.
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14. Magnetic fields interact
very weakly with
biological organisms.
It uses a "non–
radioactive mode of
energy transfer.
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15. SAFETY CONCERNS
In the “far-field”, a transmitter would emit
mixture of magnetic and potentially
dangerous electric fields. But, crucially, at a
distance of less than one wavelength - the
"near field" - it is almost entirely magnetic.
Hence, Witricity uses low frequency
electromagnetic waves, whose waves are
about 30m (100ft) long.
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16. Range Of WiTricity
WiTricity can perform electric transmission 2 cm to
3-4 meters.
Scientists are working on extending this range
Regarding efficiency –
With development done by MIT-IBM
efficiency raised to around %90 - %95
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17. “Ridiculous technology”
Witricity is not the first jump on the concept of
wireless electricity.
Today, chip-giant Intel has seized on a similar idea
to Witricity's , whilst other companies work on
highly directional mechanisms of energy transfer,
such as lasers.
However, unlike Witricity's work, lasers require an
uninterrupted line of sight, and are therefore not
good for powering objects around the home.
"You go from the sublime to the ridiculous“.
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18. Usage Areas
Electric Cars
Medical
Mobile Phones
Computers
Televisions
Any consumer electronics that needs electricity
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19. Demo 1
One source is able to
transfer the energy
for the electronic
devices.
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20. Demo 2
The main idea is that the two resonant object are at the same resonant frequency.
They tend to exchange energy efficiently without interrupting other object with
different frequency.
Aj. Roppon sings a song
with
same frequency as red
wine glass Different Frequency
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21. So, the glass of the corresponding frequency to Aj. Roppon’s voice accumulate
sufficient energy to explode.
Different Frequency
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22. Demo 3
Sony demonstrated its Demonstration of WiTricity
wirelessly powered on cellphone and LCD at
television .[2010 the TED conference.
October]
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23. Demo 4
Batteries can be
charged , it is just
enough to place the
device to top of one
of these surfaces.
CLICK HERE
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24. Demo 5
Charging
Electric Car
using
WiTricity.
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25. Future of WiTricity
Think that the city will be
covered with WiTricity hot
spots , just like Wireless
Internet, there will be no
need of charging batteries,
or carrying adapters all
around !
If we apply this idea to the whole city, we might not have to use any
wired cable. Moreover, in the future, it would save the material cost, and
“WE CAN SAVE THE WORLD, YEAH!!!”
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26. Thanks For Listening
Any Questions ?
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