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# ppt by shubham singh kalhans on witricity

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• A child on a swing is a good example of this. A swing is a type of mechanical resonance, so only when the child pumps her legs at the natural frequency of the swing is she able to impart substantial energy.
Another example involves acoustic resonances: Imagine a room with 100 identical wine glasses, each filled with wine up to a different level, so they all have different resonant frequencies. If an opera singer sings a sufficiently loud single note inside the room, a glass of the corresponding frequency might accumulate sufficient energy to even explode, while not influencing the other glasses.
While these considerations are universal, applying to all kinds of resonances (e.g., acoustic, mechanical, electromagnetic, etc.), the MIT team focused on one particular type:
resonator is a device or system that exhibits resonance or resonant behavior, that is, it naturally oscillates at some frequencies, called its resonance frequencies, with greater amplitude than at others. Although its usage has broadened, the term usually refers to a physical object that oscillates at specific frequencies because its dimensions are an integral multiple of the wavelength at those frequencies. The oscillations or waves in a resonator can be either electromagnetic or mechanical. Resonators are used to either generate waves of specific frequencies or to select specific frequencies from a signal. Musical instruments use acoustic resonators that produce sound waves of specific tones.
• In a theoretical analysis, they demonstrate that by sending electromagnetic waves around in a highly angular waveguide, evanescent waves are produced which carry no energy. If a proper resonant waveguide is brought near the transmitter, the evanescent waves can allow the energy to tunnel (specifically evanescent wave coupling, the electromagnetic equivalent of tunneling[citation needed]) to the power drawing waveguide, where they can be rectified into DC power. Since the electromagnetic waves would tunnel, they would not propagate through the air to be absorbed or dissipated, and would not disrupt electronic devices or cause physical injury like microwave or radio wave transmission might.
• In order for the power transfer to be efficient, we design the system such that the rate of energy transfer between the emitter and the receiver is greater than the rate of energy dissipation.
This way the device can capture the energy and use it for useful work before too much of it get wasted away.
• Newspapers of the time labeled Wardenclyffe &amp;quot;Tesla&amp;apos;s million-dollar folly&amp;quot;.
In spite of this he had made numerous experiments of high quality to validate his claim of possibility of wireless transmission of electricity (Fig.2). But this was an unfortunate incidence that people of that century was not in a position to recognise his splendid work
• 1.OBVIOUS ADVANTAGE OF NO WIRES
2. the transmission and distribution losses are the main concern of the present power technology. Much of this power is wasted during transmission from power plant generators to the consumer. The resistance of the wire used in the electrical grid distribution system causes a loss of 26-30% of the energy generated. This loss implies that our present system of electrical distribution is only 70-74% efficient.
3. Need more light in your office, Simply place the lamp where ever you need it.
• 3. It is like Wi-Fi, someone can be using your internet or your power
• Electromagnetic interference (or EMI, also called radio frequency interference or RFI) is an unwanted disturbance that affects an electrical circuit due to electromagnetic radiation emitted from an external source. [1] The disturbance may interrupt, obstruct, or otherwise degrade or limit the effective performance of the circuit. The source may be any object, artificial or natural, that carries rapidly changing electrical currents, such as an electrical circuit, the Sun or the Northern Lights.
EMI can be induced intentionally for radio jamming, as in some forms of electronic warfare, or unintentionally, as a result of spurious emissions and responses, intermodulation products, and the like. It frequently affects the reception of AM radio in urban areas. It can also affect cell phone, FM radio and television reception, although to a lesser extent.
EMI or RFI may be broadly categorized into two types; narrowband and broadband.
Narrowband interference usually arises from intentional transmissions such as radio and TV stations, pager transmitters, cell phones, etc. Broadband interference usually comes from incidental radio frequency emitters. These include electric power transmission lines, electric motors, thermostats, bug zappers, etc. Anywhere electrical power is being turned off and on rapidly is a potential source. The spectra of these sources generally resembles that of synchrotron sources, stronger at low frequencies and diminishing at higher frequencies, though this noise is often modulated, or varied, by the creating device in some way. Included in this category are computers and other digital equipment as well as televisions. The rich harmonic content of these devices means that they can interfere over a very broad spectrum. Characteristic of broadband RFI is an inability to filter it effectively once it has entered the receiver chain. [2][3] [4]
• ### ppt by shubham singh kalhans on witricity

1. 1. A Power point presentation by, SHUBHAM SINGH EE 3rd Year, 1173720053, MKECIT,AMBEDKAR- NAGAR
2. 2. TOPICS TO BE DISCUSSED 1. INTRODUCTION 2. BASIC PRINCIPLE 3. WORKING 5. EFFICIENCY 6. DEVELOPMENT OF WITRICITY 7. ADVANTAGES 8. LIMITATIONS 9. SCOPE 10.THE FUTURE ASPECTS 4. EXPERIMENTAL SETUP
3. 3. INTRODUCTION
4. 4. WITRICITY is the transfer of electricity from one place to another without interconnecting wires. WITRICITY is a Combination of words for expressing Wireless Transmission of Electricity. Allows power to cross distances even when there is no physical connection between the power source and the object to be charged. WHAT IS WITRICITY???
5. 5. BASIC PRINCIPLE INVOLVED
6. 6. PRINCIPLE OF WIRELESS TRASMISSION OF ELECTRICITY MAGNETICALLY COUPLED RESONANCE Two resonant objects of the same resonant frequency tend to exchange energy efficiently, while interacting weakly with extraneous off-resonant objects MAGNETICALLY COUPLED RESONATORS The system involves two electromagnetic resonators coupled through their magnetic fields. This enabled efficient power transfer, even when the distance between them was several times larger than the sizes of the resonant objects.
7. 7. WORKING
8. 8. How Wireless Electricity Works The oscillating current inside the transmitting coil causes the coil to emit a magnetic field. A circuit A attached to the power supply supplies power to the transmitting coil B. The setup requires two identical coils with one coil connected to a load,like a bulb.
9. 9. The receiving coil C has the exact same dimensions as the sending coil B and thus resonates at the same frequency and due to a process called magnetic induction voltage is induced in coil C. Thus,coil C picks up the energy of the coil B’s magnetic
10. 10. The energy of the oscillating magnetic field induces an electrical current in the receiving coil, lighting the bulb D.
11. 11. EXPERIMENTAL SETUP
12. 12. EXPERIMENTAL SETUP Simulate a transfer of 60W across two identical loops similar in dimension. The coils had a radius of 30 cm,with a cross section of 3cm and distance between the coils was 200m.
13. 13. Transmission of electricity is occurring inspite of the obstruction in between.
14. 14. An alternate view of the previous picture.
15. 15. EFFICIENCY
16. 16. We determine the efficiency of transfer of energy takingWe determine the efficiency of transfer of energy taking place between the source coil and the load by measuring theplace between the source coil and the load by measuring the current at the midpoint of the each coils with a currentcurrent at the midpoint of the each coils with a current probe.probe. EFFICIENCY OF WITRICITY
17. 17. DEVELOPMENT OF WITRICITY Is WITRICITY an entirely new concept?
18. 18. Wireless power transmission is not a new idea. Dr.Nikola Tesla demonstrated a "transmission of electrical energy without wires" that depends upon electrical conductivity as early as 1891. DEVELOPMENT OF WITRICITY The Tesla effect (named in honor of Tesla) is the term for an application of the wireless movement of energy through space and matter, not just the production of voltage across a conductor. Dr. Nikola Tesla shows us that he is indeed the “Father of the Wireless”
19. 19. Starting in 1901, Tesla made Wardenclyffe Tower Project for wirelessly sending industrial amounts of energy on large-scale. “ Ere many generations pass, our machinery will be driven by a power obtainable at any point of the universe ”. William C.Brown He showed how power can be transferred through free space by microwaves.
20. 20. INVENTOR OF WITRICITY The experiment involving the discovery of WITRICITY was led by MIT physics professor Marin Soljacic and was reported on the June 7,2007. From left to right: Soljacic, Karalis, and Joannopoulos, with a figure from their paper in the background.
21. 21. ADVANTAGES OF WITRICITY Say good bye to wires…
22. 22. ADVANTAGES OF WITRICITY NO POWER CORDS The electrical energy can be transmitted without wires, so there will be no need of power cords. LOW POWER LOSS Due to absence of conventional wiring system,transmission losses are very low. PROVIDES EARTH FREE SUPPLY Reduces chances of electric shock.
23. 23. CONVENIENT No need for external wiring so no need for electrician. No meter rooms and electrical closets required. NO TRANSFORMER NEEDED It eliminates the need of Step Down Transformers. Shockless life..
24. 24. LIMITATIONS
25. 25. LIMITATIONS OF WITRICITY EXPENSIVE Retrofitting old equipment or purchasing new equipment could become a very expensive endeavor. ENERGY THEFT Possibility of energy theft. DISTANCE This technique can transmit electricity for short distances.
26. 26. Employed in cases where instantaneous and continuous transfer of power is needed. SCOPE OF WITRICITY To overcome situations where normal cabling is difficult or financially impractical
27. 27. THE FUTURE WITHIN NEXT 10 YEARS Short distance induction  Cell phones  Batteries  Laptop Computers  Mp3 players  Artificial hearts.
28. 28.  After 50 Years – Moderate distance Induction  Household robots  Cars  After 100 Years – Long distance  Airplanes
29. 29. THANK YOU QUERIES???