What is Wireless electricity: Definition and 13 Discussions

Wireless power transfer (WPT), wireless power transmission, wireless energy transmission (WET), or electromagnetic power transfer is the transmission of electrical energy without wires as a physical link. In a wireless power transmission system, a transmitter device, driven by electric power from a power source, generates a time-varying electromagnetic field, which transmits power across space to a receiver device, which extracts power from the field and supplies it to an electrical load. The technology of wireless power transmission can eliminate the use of the wires and batteries, thus increasing the mobility, convenience, and safety of an electronic device for all users. Wireless power transfer is useful to power electrical devices where interconnecting wires are inconvenient, hazardous, or are not possible.
Wireless power techniques mainly fall into two categories, near field and far-field. In near field or non-radiative techniques, power is transferred over short distances by magnetic fields using inductive coupling between coils of wire, or by electric fields using capacitive coupling between metal electrodes. Inductive coupling is the most widely used wireless technology; its applications include charging handheld devices like phones and electric toothbrushes, RFID tags, induction cooking, and wirelessly charging or continuous wireless power transfer in implantable medical devices like artificial cardiac pacemakers, or electric vehicles.In far-field or radiative techniques, also called power beaming, power is transferred by beams of electromagnetic radiation, like microwaves or laser beams. These techniques can transport energy longer distances but must be aimed at the receiver. Proposed applications for this type are solar power satellites, and wireless powered drone aircraft.An important issue associated with all wireless power systems is limiting the exposure of people and other living beings to potentially injurious electromagnetic fields.

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  1. José Ricardo

    Post with wireless electricity is it possible?

    A post, each which connected without a wire, is it possible in a brief future?
  2. J

    Wireless Electricity Transmission

    Folks, I am still thinking of the possible approach to solving a problem of having to run poles and power lines to transmit electricity from one point to the other. Can there be a way it could be done in that we can convert electric current into electro-magnetic waves that can be transmitted...
  3. Abd El Rahman

    Wireless power transfer topics

    Hello , I am doing my M.Sc in wireless power transfer using resonant inductive coupling.I want to know what topics i should read and understand to master this research.
  4. L

    Testing rear window defroster grid

    Hello, I would like to develop a testing method to detect window defroster grid failures. Rear windows has 12 heating wires painted to the glass and cca. 2% are faulty pieces. I tried to measure the resistance, current and voltage drop of good parts and compare results with those where was at...
  5. M

    Inductive transfer via mag. fields, max power transfer?

    Hey guys; I'm looking for info on the maximum power transfer using the magnetic induction method. The current through a coil, then catch the mag field with another coil idea. Mainly looking for high energy transfer methods, maybe some equations that describe it. A friend and i are playing...
  6. B

    Wireless Electricity: Magnetic Resonance vs. Magnetic Induction

    What is the difference between magnetic resonance and magnetic induction when it comes to charging devices and other types of wireless electricity. I was doing some research on this but was not able to find a clear answer. If someone could help me with this that would be greatly appreciated...
  7. R

    Eric Giler: Wireless Electricity Demo

    http://www.ted.com/talks/eric_giler_demos_wireless_electricity.html In this video, I have two questions: 1) Why have a capacitor as part of the two circuits? Is it so no actual current flows around the coils, that's all I could come up with. 2) In the picture he shows of the two...
  8. B

    3 ways wireless electricity transmissions

    Homework Statement list 3 ways of wireless electricity transmission and how??Homework Equations The Attempt at a Solution i got nothing =.=
  9. R

    Wireless Electricity: Replicating MIT's Witricity on Smaller Scale

    I'm trying to replicate MIT's "Witricity", but on a smaller scale. I have a coil connected to a function generator and then a second coil (with more loops than the first) connected to an LED. So I guess now I have a transformer. And the LED lights up when the coils are up to 10cm apart. I...
  10. M

    Making Self resonating coils for wireless electricity transfer How to do

    Making Self resonating coils for wireless electricity transfer ! How to do @@ Dear Friends , I would like to make the wireless electricity project as done by MIT team.i am bit confused about how to make the two different coils resonate at the same frequency ?? Please help me... Thanks...
  11. D

    Wireless Electricity: Exploring Possibilities

    I came across an interesting story today and thought I would share it here. http://www.fastcompany.com/magazine/132/brilliant.html" Neat stuff. Although I do wonder, even if they get it working and feasible for large-scale adoption, would there be any adverse health affects? (I...
  12. A

    Exploring the Potential of Wireless Electricity Implementation and Applications

    Can someone tell us about the possible implementation and application of wireless electricity? I know there is a lot of interest in the topic and recently, I read that MIT made a successful experiment of transferring power wirelessly. If we can concentrate the beam of the transmitting element...
  13. R

    Quantum entanglement and wireless electricity

    I read about quantum entanglement in an article about teleportation I read on the web. If two particles can be connected despite an enormous distance, in such a way that the properties of one can be transferred to another, even though no wire or string is linking them, can you use this...