Witricity is a technology that wirelessly transfers electricity between a power source and a device using magnetic induction. The document discusses the history of witricity beginning with research at MIT in 2007 that demonstrated wirelessly powering a light bulb. It works by generating oscillating magnetic fields from a transmitting coil connected to a power source, which induces a current in a receiving coil connected to a device. Advantages include eliminating wires and allowing power transfer in any direction. Limitations include inefficiency over long distances and standardization challenges. Safety is ensured because magnetic fields pass harmlessly through living tissues. Potential applications include charging phones, laptops, TVs, electric cars and powering military and medical devices wirelessly.

1. WITRICITY
MANISH BHARTI
B.TECH (EC) 3RD YEAR
ROLL NO:-1271931008

2. OVERVIEW
• What is Witricity?
• History
• Need of Witricity
• Principle of Witricity
• Working
• Advantage
• Limitation
• Safety
• Conclusion

3. 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.

4. History
• The term WiTricity was used for a project that took place
at MIT, led by Marin Soljacic in 2007.
• The MIT researchers successfully demonstrated the ability
to power a 60 watt light bulb wirelessly, using two 5-turn
copper coils of 60 cm diameter, that were 2 m (7 ft) away, at
roughly 45% efficiency and roughly 90% efficiency at a
distance of 3 feet.

5. 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 present generation wireless energy
transfer.

6. 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.

7. Projecting magnetic field Induced EMF due to change in flux

8. WORKING OF WITRICITY
• 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.

9. 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.

10. 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.
Limitations

11. 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.

12. APPLICATION
• Wireless electricity can be used to power or
recharge:
• Cell Phones
• TVs
• Computers
• Electric Cars
• Medical Devices (pacemakers, etc.)
• Military Devices (unmanned robots, planes)
• Consumer Appliances

13. Thank you