This presentation discusses Witricity, which is the transfer of electricity without wires using magnetic induction. It works by converting electricity to a magnetic field using a transmitting coil, which induces a current in a receiving coil. Witricity was pioneered by Nikola Tesla and recent research by MIT aims to develop it further for applications like charging phones and electric vehicles without plugs. While it offers advantages like no wires or cables, Witricity also faces challenges of limited range, efficiency, and standardization that must be addressed for practical use.

1. Presentation on
WITRICITY
Department of Electronics & Communication Engineering
Jaipur National University, Jaipur
Presented by : SANJAY KUMAR ( Roll No: 8EC33)

2. CONTENTS
• Introduction
• Why do we need?
• Principle of Witricity
• Theories
• Features
• Background
• Is witricity safe?
• Advantage, Disadvantage, Application
• Conclusion
• Reference 2

3. INTRODUCTION
• The Transfer of Electricity from
one place to another without wires
is known as “WiTricity”.
• WiTricity technology is
transferring electric energy or
power over distance without wires,
with the basics of electricity and
magnetism.
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4. Why We Need?
• Now-a-days due to rapid increase of electronic
goods like cell phones, laptops, i-pods etc. Which
rely on the chemical storage of energy by the battery
& need to recharge frequently twice a day.
• Leads to lot of E-waste.
• Precautions to be taken for electrician while working
otherwise he can get shock.
• As they are becoming daily needs to present
generation, Wireless energy transfer would be useful
for many applications as above and they need
midrange energy.
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5. Principle Of Witricity
• Witricity works on the principle of mutual
induction between the two coils.
• The first coil is attached to the power source
while the second coil to the light bulb.
• When the power is switched on the first coil
converts the electricity into magnetic field,
which is oscillating at a particular frequency
i.e, AC source.
• The second coil at the receiver end converts
the magnetic field into electricity .
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THEORIES
Two theories:-
1)NEAR FIELD THEORY
• Valid only for few range (in meter).
• Uses Resonant inductive coupling
between two coils that are tuned to
resonate at the same frequency.
2)FAR FIELD THEORY
• Valid for large ranges (in km).
• Uses radio wave and laser’s between
source & receiver.
Near field theory
Fear field theory

7. FEATURES
• Highly Resonant Strong Coupling Provides High Efficiency over
Distance.
• Energy Transfer via Magnetic Near Field can Penetrate and Wrap
Around Obstacles.
• Non-Radiated Energy Transfer, hence is Safe for People and
Animals.
• Scalable Design enables solutions from milliwatts to Kilowatts.
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8. BACKGROUND
NIKOLA TESLA
• He did enlighten many lamps at the distance of
2m wirelessly.
• Later the team from Massachusetts Institute of
Technology (MIT) led by Prof. Marin Soljacic
extend his work and they named their invention
“WiTricity”(Wireless Electricity).
• In the first trial, the team was able to illuminate
a 60-watt light bulb 7ft away.
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NIKOLA TESLA
WiTricity team from MIT

9. Is WiTricity Safe?
• Many are concerned about another radio fields or frequency
flying through the air. Some believe that these are harmful
to the body, but there is little evidence to suggest they are.
• WiTricity, however, turns electricity into a magnetic field,
which is a non-radiative transfer method.
• WiTricity has been scientifically proven not to be harmful
and has been designed to comply with applicable safety
standards and regulations.
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10. ADVANTAGES
• No need of line of sight.
• No need of power cables.
• Wastage of power is small.
• Reduction of e-waste by eliminating the need for power cords.
• Does not interfere with radio waves.
• Negative health implications.
• Able to penetrate anything.
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11. DISADVANTAGES
• Wireless power transmission can be possible only in few meters.
• Efficiency is only about 40%.
• Need for standardization and adaptation. So a little overheating
occurs because of different voltages.
• Refitting old equipment or purchasing new equipment could
become a very expensive endeavor.
• Possibility of “energy theft”.
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12. Application of WiTricity
• Consumer Electronics
• Electric Vehicles
• Medical Devices
• LED Lighting
• Defence Systems
• Automatic car charging technology
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13. Just Imagine Our Future
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CONCLUSION
Think that the city will be covered
with WPT 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,
&
“ W E C A N S A V E T H E W O R L D F R O M W I R E S”

15. REFERENCE
• http://www.witricity.com
• www.techjournal.com
• http://www.slideshare.co.in
• http://ieeexplore.ieee.org/Xplore/
• IEEE Standard for Safety Levels with Respect to Human Exposure
to Radio Frequency Electromagnetic Fields, 3 kHz to 300 GHz,
IEEE Std. C95.1-2005
• Wireless electricity could power consumer, industrial electronics".
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