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Plethora of Electrons

Discussion in 'Electronic Basics' started by gkg, May 6, 2004.

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  1. gkg

    gkg Guest

    They are rather scholastic questions but I need to know for certain.

    When any radio is tuned to a particular channel, is it fundamentally
    receiving electrons?

    When a radio is being used to communicate [any type, military or
    civilian] is it emitting electrons?

    The question is that are electrons emitted and received by radios?

    When a cordless phone is being used, is it also emitting and receiving
    electrons?
     
  2. No. It is receiving photons that interact with the electrons of atoms.
    No. It is transmitting photons.
    No.

    All of E&M is the exchange and interaction of photons.

    Kevin Aylward

    http://www.anasoft.co.uk
    SuperSpice, a very affordable Mixed-Mode
    Windows Simulator with Schematic Capture,
    Waveform Display, FFT's and Filter Design.
     
  3. Don

    Don Guest

    No electrons are being transmitted. Radio waves are. Sort of like a magnet.
    Ever get shocked my a magnet? No, because no electrons are being emitted.
    try using google on how does radio work.
     
  4. No, electrons are particles that do not go very far, they will collide
    with atoms. That is why your tv tube is vacuum: there is an electron
    beam inside.

    Radio uses electromagnetic fields, kind of a combination of electric
    and magnetic fields.

    Regards,
    Pieter Hoeben
    http://www.hoeben.com
     
  5. Bob Myers

    Bob Myers Guest

    ROTFL...OK, Kevin, I gotta admit, that's a good one.
    Technically correct, of course, but I'm afraid it may be more
    confusing than helpful to the original poster.

    Let's tackle this from a more classical perspective, and forget
    the quantum mechanics for a bit. (Which is best, since I can't
    do quantum mechanics since having misplaced my quantum
    wrench last week...)

    Radio transmitters do not emit electrons, and radio receivers
    do not receive electrons. What actually passes between the
    two are "electromagnetic waves" (which is really the same thing
    as light, and hence "photons" as Kevin said, but in the case of
    any practical radio equipment we're talking about MUCH lower
    frequencies than in the case of visible light).

    To understand this, realize that electrically charged particles -
    such as electrons - produce "electric fields" (which you can
    see by bringing charged objects together - the fields between
    them cause attraction or repulsion, depending on whether the
    charges are of opposite or same sign, respectively). MOVING
    charges, such as electrons traveling through a conductor, also
    produce MAGNETIC fields, which you can demonstrate via
    a simple electromagnet.

    In the case of radio, the transmitter causes charge to move in
    the transmitting antenna - which is, fundamentally, a structure
    which is designed in such a way as to produce the electric and
    magnetic fields coming from these moving charges in the
    proper relationship so as to produce an "electromagnetic wave"
    - which consists of both electric and magnetic fields in a
    certain relationship, and which will sustain itself such that it
    can travel and maintain this relationship over long distances.
    When these electromagnetic waves strike a conductor - such a
    the receiving antenna - they in turn cause the charges within that
    antenna (the electrons) to move in a way identical to those at
    the transmitter (although at greatly reduced strength, as very, very
    little of the energy produced by the transmitter will ever be
    captured by the receiver. So the receiving antenna can be
    considered a structure which converts the electromagnetic waves
    back into moving charge (or, in simpler terms, current and voltage).
    (And oddly enough - or, when you think about it, not so oddly
    after all - the same structure that works best as a transmitting antenna
    also works as a receiving antenna. So the short form answer
    again is that there is no transport of electrons themselves
    between transmitter and receiver, but moving electrons wind up
    both being responsible for the transmitted signal, and produced
    at the receiver.

    Bob M.
     
  6. equalizer

    equalizer Guest


    Try using a spell checker.
     
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