This document discusses wireless power transmission, known as WiTricity. It begins by explaining that WiTricity involves transmitting electrical energy from one object to another without wires. The document then provides a brief history of wireless power, including Nikola Tesla's early experiments and MIT's development of WiTricity. It goes on to describe the basic working principles of WiTricity, including inductive coupling and resonant induction. The document also discusses the types, efficiency, applications, advantages and disadvantages of WiTricity. It concludes by stating that wireless power transmission is now a reality and could reduce energy costs while eliminating power lines.

1. By-M.SHIVAKUMAR
160711734009

2. Contents
 What do you mean by Wi Tricity ?
 Need of witricity
 History of wireless power
 Witricity Basics
 Working Principle
 Types of witricity
 Is Wi Tricity safe ?
 Efficiency of witricity
 Application ofWiTricity ?
 Advantages
 Disadvantages
 Conclusion

3. 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
Witricity.
Because of Witricity some of the devices won’t
require batteries to operate .

4. Why we need Witricity?.
WE USE WIRES…

5. And we use...

6. Which sometimes ends as…

7. History of Wireless Power:
 In 1899, Sir Nikola Tesla Proposed a method
of Wireless Power Transmission.
 As it is in Radiative mode, most of the Power
was wasted and has less efficiency.
 Able to light lamps over 25 miles away
without using wires
The team from Massachusetts
Institute of Technology, who call
their invention ‘WiTricity‘.
In the first successful trial of its
kind, the team was able to
illuminate a 60-watt light bulb 7ft
away.

8. BASICS OF WITRICITY

9. WORKING:

10. Types of WiTricity
In general, witricity is classified into three
types, they are:
 Short range; Inductive Coupling.
 Medium range; Resonant Induction.
 Long range; Electromagnetic Wave PowerTransfer.
Short Range Medium Range 1L0ong Range

11. Inductive Coupling:
 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.
 When a wire is in proximity to a magnetic field, it generates a
current in that wire.
 Magnetic fields decay quickly , making inductive coupling effective
only at very short ranges.
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12. Resonant induction:
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.

13. Cont…
 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.

14. Cont…
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15. Cont….
 Our experimental scheme consists of two Self-resonant
coils. One coil (source coil) is coupled inductively to an
oscillating circuit; the other (device coil) is coupled
inductively to a resistive load. Self-resonant coils rely on
the interplay between distributed inductance and
distributed capacitance to achieve resonance.
Experimental Design Electrica15l Resonance

16. Long range:
In long range the electricity is converted into
microwaves and transmitted for a long
distances
 It is a on going research in the field of
WiTricity
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17. 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. Magnetism interacts
very minimally with biological organisms and is not harmful at
all to humans or animals.
 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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18. WITRICITY CONCERNS
 Will it harm us?
 Will it harm the environment?
 Will it interfere with important
communication?
NO
18 WiTricity 11/7/2014

19. How efficient is WiTricity?
 WiTricity have only about 40-45% of efficiency.
 The efficiency of WiTricity is based on distance between
the source coil and the load coil.
 And it is mainly based on the resonating frequency of the
coils.
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20. 20

21. ADVANTAGES
No need of power
cables and
batteries.
Does not interfere
with radio waves.
Wastage of power is small .
Negative health implications.
Highly efficient than
electromagnetic induction
Less costly.

22. DISADVANTAGES
 Transmissions possible only in few meters
 Possibility of “energy theft”
 Efficiency decreases with distance
 The resonance condition should be satisfied
and if any error exists, there is no possibility of
power transfer.

23. Conclusion:
 The transmission of power without wires is not theory
or a mere possibility, it is now a reality. The electrical
energy can be economically transmitted without wires to
any terrestrial distance.
 The system would reduce the cost of electrical energy
used by the consumer and get rid of the landscape of
wires, cables, and transmission towers. It has negligible
demerits like reactive power which was found insignificant
and biologically compatible.
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