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Wireless electricity?

Discussion in 'General Electronics' started by KellyClarksonTV, Aug 6, 2004.

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  1. Can electricity be sent through the air like radio waves? (60Hz) Wireless
    electricity would be way way conveinent, plus it would eliminate those
    expensive and explosive batteries.
  2. Lighting works But the repair cost get to be pretty high.
    Tesla did it way back when, look up Tesla Coil, but the catch is It is
    in the form of broad band RF (hard to collect) and goes every where so
    you can't stop any one from tsping into it.

    OK where are those Cold Fusion batteries anyway.
  3. Robert Baer

    Robert Baer Guest

    Tesla's idea *was* to have free electricity.
    Mr. Westinghouse hated him.
  4. Fred Stevens

    Fred Stevens Guest

    Many years ago I heard of an idea to generate electricity using
    orbiting photovoltaic cell systems and beaming the power to earth via
    microwave. I have seen a paper where a small helicopter was powered
    using a microwave beam, but I don't think we will have microwave
    powered vacuum cleaners or lawnmover very soon!

  5. Sending electrical power through the air has been demonstrated
    experimentally. A small unmanned airplane with an electric motor was
    kept aloft powered by microwaves beamed at it from the ground. The
    airplane was built with "rectannas" (as in rectifier-antennas)
    covering its wings. I believe that the aircraft had batteries which
    powered it untill it finally flew into the microwave beam. You can
    read more at the following link:

    Unfortunately this appears to be an expensive proposition.
  6. I can't imagine the interference problems this would make with
    communications systems. Electric power at practical levels would
    require very high power factors just to translate it in to the air,
    and re-detect it again.

    Tesla had some theories about this, but was not able to achieve
    anything practical. He did many new innovations and discoveries. There
    are also many people who exaggerated on his achievements. These are
    some of the same types that are believing and promoting perpetual
    energy and motion.

    Jerry G.
  7. Julie

    Julie Guest

    I don't know if that is really correct to call it 'electrical power', since it
    is electromagnetic energy that is actually transmitted, not electron energy.
    On board, the EM energy is converted into electron energy (electricity).

    If you open up the topic to wireless /energy/, there are a lot of EM, laser,
    and related topics.
  8. Charles Jean

    Charles Jean Guest

    Check out the APM-2 "Advanced Power Module", at

    Milliwatt range, but it's "free" wireless power.


    It's not just a good idea-IT'S THE LAW!
  9. SolarWind

    SolarWind Guest

    There are two items need to be considered:

    1. Efficiency : You can use low frequency or high frequency such as
    Laser beam to send energy from "A" to "B" wireless, it is meaningless
    if the power efficiency( receiving power per sending power) too low.
    At beginning, scientists may accept 10% effciency, but industry may
    ask for it up to 95%. In generally speaking, the wireless power
    transmission is hard to reach up to 50% efficiency.

    2. Direction control : For Laser beam that transmits in straight
    direction with high efficiency, and low frequency beam will transmit
    in scattering direction but low efficiency. It is danger to use Laser
    beam in home.
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