1. Presentation On:
Witricity
(wireless electricity)
Presented By:
Deep Khanna
11/FET/EC/1107
Electronics & Telecomm. Engg.

2. WITRICITY

3. OUTLINE
History of Witricity
What is witricity
Need of witricity
Working principle of witricity
Advantages
Limitations
Safety
Range of witricity
Block diagram of Witricity
Usage areas
World in future

4. HISTORY OF WITRICITY
Originally demonstrated in 1964 on CBS using model
helicopter
1969-1975 30 kW over 1 mile at 84% efficiency

5. Nikola Tesla – The Genius
He did enlighten 200 lamps at the distance of
40 km,
Wirelessly !

6. Prof. Soljacic – Another Genius
MIT-IBM Collaboration
He did succeed to redesign Tesla’s experiment in
safer way.

7. What is Witricity?
 Transfer of electricity without using connections between
input and load is termed as wireless electricity.
 This is not like wireless transmission of signals which we used
in the cell phones.
 In cell phones signals are sent in the form of micro waves
whereas in this mode of transition electricity is transferred in
the form of magnetic rays.
These rays are not harmful to humans.
 The transfer of energy is mid range compared to direct
transmission.

8. Need of Witricity
 Now-a-days there is a rapid increase of electronic goods like cell
phones ,laptops ,I-pods etc., which rely on the chemical storage of
energy by the battery which need to be recharged frequently .
 As these are becoming daily needs to the presents energy transfer
i.e, witricity would be useful for many applications as these things
need mid range energy.

9. Technique To Transfer
• One Simple Physics Rule !
• At Source : Electricity => Magnetic Wave
• At Device : Magnetic Wave => Electricity
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10. Working principle of Witricity
Witricity works on the principle of mutual induction between the two
coils.
There are two copper coils arranged one at the sender end and other at the
receiver end .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 .The surrounding environment is unaffected.

11. Projecting magnetic field
Magnetic vector notation
dB=udH
Induced EMF due to change in flux
___ ___

12. Advantages
 An advantage is that we can produce electricity anywhere without
wires
 The power can be delivered in any direction i.e, omnidirectional
 Most common things in our surroundings do not interact with these
magnetic fields and thus not harmful to other living beings
 Significant decluttering of office space
 No need for meter rooms and electrical closets.
 Reduction of e-waste by eliminating the need for power cords
 Need more light in your office, no need for electrician. Simply place
the lamp where ever you need it.

13. Limitations
The flux condition should satisfy certain conditions,if not no power
supply takes place.
There is a lose of power transmission if there is a strong ferro-magnetic
substance.
 Need for standardization and adaptation. So no overheating occurs
because of different voltages.
 Retrofitting old equipment or purchasing new equipment could
become a very expensive endeavor.
 Possibility of “energy theft”. Wi Fi, someone can be using your
internet or your power.

14. Safety
 Any living organisms that are placed in between the two coils(transmitter
&emitter) will not halt or hinder the transmission of magnetic field.
 It is because the magnetic rays will not interact with the living tissues so strong
and can be easily passed through the humans or other living organisms.

15. 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. USAGE AREAS
• Electric Cars
• Medical
• Mobile Phones
• Computers
• Televisions
• Any consumer electronics that needs electricity
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18. World in our future