This document discusses wireless electricity or "witricity", where electrical energy is transmitted through air without wires. It begins by defining witricity and explaining that cables will be replaced. There are several reasons for needing wireless electricity, such as the demand for power everywhere and more eco-friendly options. The document then covers the different techniques for wireless energy transfer including short range inductive coupling, mid-range resonant inductive coupling, and long range microwave and laser transmission. It provides examples of applications for both short/mid range and long range wireless power including charging electric vehicles and powering satellites. In conclusion, the document states that wireless electricity is necessary to deal with energy crises, though challenges like costs and interference would need to be

1. ELECTRICITY WITH
WITRICITY
Presented by :
K.S.NIKHILESH
DEPARTMENT OF ELECTRICAL &
ELECTRONICS ENGINEERING.
SNIST

2. Definition is : “Transmission of
energy through air.”
Cables are going to replaced by
Witricity. The transmission of
electrical energy without wires to any
place on the earth .

3. Block diagram for witricity mechanism

4. Why do we need wireless
electricity???
The need of electricity in every nook
and corner of the world
The demand of eco-friendly power
Requirement of efficient and reliable
power
To reduce dependence on wires and
batteries

6.  In the year 1891,NikolaTesla
proposed the method of
wireless transmission of
electric power.
 One of the greatest
breakthroughs of science at that
time

7. TYPES OF WIRELESS ENERGY TRANSFER
TECHNIQUES ARE:-
 Short range– Inductive coupling.
 Mid range– Resonance Inductive
Coupling.
 Long range-Microwave Transmission
& Laser Transmission.

8. Wireless electricity makes
use of the concept-
“Oscillating electric field
produces magnetic field
and oscillating magnetic
field produces electric
field”.

9. Resonant Inductive Coupling
Uses almost the same
concept as Inductive
coupling just that the
coils operate at resonant
frequency leading to
efficient transfer of
energy over a larger
distance.

10. Di f f e r e n t F r e q u e n c y
Resonance
Property of systems to operate at higher amplitudes at
purticular frequencies known as resonant frequencies
than at others.
When 2 objects operate at same resonant frequency they
transfer energy efficiently between them without interfering
with the off resonant objects.

11. The glass which was having the resonant
frequency as of the singer’s voice
accumulated sufficient energy to explode
eventually.
Di f f e r e n t F r e q u e n c y

12. Efficiency chart of
witricity
It is observed that efficiency decreases with
increase in distance between source coil and
load coil

13. Applications of Witricity(short range and mid range)
1.DIRECT WIRELESS POWER
No device would need wires
For TVs, toasters or any form of
immobile electronic devices.
2. AUTOMATIC WIRELESS
CHARGING
Device with rechargeable batteries
charges itself.
For any form of mobile devices .
3.INDUSTRIAL
would be free of heavy installation of
wires and devoid of any hazardous
electric shock incidents.
4.TRANSPORTATION
Could charge an electric car or
automobile.

14. Types of Long range/Far field
transmission techniques
Microwave Transmission
extracts small quantities of
energy in the range 902 and 928
MHz
Disadvantage—interference caused
by metal surfaces.
Laser Transmission
Highly directional and coherent
Inefficient for wireless power
transmission

15. MicrowaveTransmission
Aims at higher power transfer over longer distances
practically in the range of some miles
Requires a microwave source, antenna and rectenna.
operates in the frequency range of 1-40GHz
operates at the highest efficiency at 2.45GHz
Steps:
1.conversion of electrical to microwave
Energy.
2.Capturing of microwave beams by
Recttena.
3.conversion of microwave to electrical
Energy

16. Applications of long range transmission
SOLAR POWER SATELLITES:
The most imp. Application or advancement:
absorb light energy from sun.
converted to electric energy and beamed to earth
stations in form of microwave beams
so it can power satellites,aircrafts,even supply
electricity to places where wired connections are not
possible at lower prices.
SPACE POWER TRANSMISSION AND LUNAR BASED
PROJECTS:
Satellites in space can receive microwave signals
from earth and beam it to any place on earth.
In future it encourages power projects on the
moon.

18. Image of a Rectenna in US with diameter of about half a
mile which is important as 95% of the microwave power
is received by rectennas.US receives about 5000MW of
power as a result.

19. Wireless power transmission and reception
using microwaves

20.  Unlimited energy resource
 Energy delivered anywhere in the world
Zero fuel cost
Zero CO2 emission
Minimum long-range environmental impact
Solar radiation can be more efficiently collected in space

21. Launch costs .
 Capital cost even given cheap launchers .
Would require a network of hundreds of satellites .
The size of the antennas and rectennas.
Geosynchronous satellites would take up large sections of space.
Interference with communication satellites

22. Conclusion:
Wireless electricity is not just a great idea but an urgent
measure that has to be taken to deal with the current
energy crisis.
Even the smallest entity can lead to one of the most
mindboggling dilemmas of the world. Electrons the source
of electricity puts us in a similar fix. It is on us to decide
how to tap these electrons to be useful in our lives.
Wireless electricity comes with its baggage but no can
deny that it is here to stay.
Prospects & Issues:
From the discussion its clear that this idea needs
awareness to remove doubts from minds of the people
about safety issues.
It requires both support from government and the people
financially and psychologically.