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Re: Running an empty microwave oven

Discussion in 'Beginner Electronics' started by Snap Whipcrack.............., Jan 23, 2007.

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  1. Microwave ovens don't care what you put inside. They do not have
    feedback loops. You can cook a raisin or a melon or nothing at all.
  2. It dissipates. Where do you think the microwave transmitters on mountain
    tops power ends up? It doesn't go round and round the earth forever.
  3. Peter-

    If there is nothing in the microwave, there is no load, or at least very
    little. If there is no load, there is no power dissipated. It is
    somewhat like having 120 VAC at the wall socket with nothing plugged-in.

    The problem isn't heat as much as voltage. With no load, the magnetron
    voltage will be higher than normal. The question is really whether or
    not damage will occur from over-voltage.

    Someone in another thread a few weeks ago, said that only very early
    microwave ovens would be damaged by running them empty. I know that one
    I bought in 1976 came with a warning about running it empty, as well as
    not putting anything metallic in it. However, two that were bought
    about ten years ago did NOT come with such warnings, and even came with
    metal racks!

  4. Same question, where do the light waves go from the light inside the
    microwave? Same energy, just higher frequency and lower power. Same
    place as the microwaves.
  5. Bill Janssen

    Bill Janssen Guest

  6. jasen

    jasen Guest

    that's not happening not unless those sides are superconductive
  7. PeterD

    PeterD Guest

    WEll, almost right... (and your 'normally' does apply, so what you say
    is true, but there's more! <bg>)

    All you need is pressure, not a combustable substance.

    In the case of the balls that 'exploded' were they to have a 'strong'
    outter shell, and a high moisture content inside, the moisture could
    easily convert to steam and build up pressure until the outer shell
    failed--an explosion... It would not be difficult to build up a
    hundred PSI of steam pressure, and that would result in a rather large
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