Ohms/KOhms/MOhms Plese explain it to me.

Discussion in 'Electronic Repair' started by Red, Sep 3, 2003.

  1. Red

    Red Guest

    I know Ohms is resistance. What I am trying to figure out is the
    relationship between an Ohm, a KOhm and a MOhm at the same Wattage.

    How many of one does it take to make one of the others?

    Is 334KOhms the same as .334MOhms at the same wattage? If so then how many
    Ohms is that?

    If I check resistance of a 1 MOhm Linear-Taper Potentiometer (500VDC, 0.5W)
    with my DMM It starts out with a reading of 01.5 Ohms, and the number rises
    until somewhere around 3XX.XX Ohms it switches to .3XX KOhms. As I turn it
    farther the number rises until it gets to about 32X.XX when it switches to
    ..32X MOhms.

    I have looked all through the Machinery's Handbook, and a few Machinist
    books, but they all deal with mechanical things, though they do concede
    there is such a thing as electricity and it comes out of a wire. Stepper
    motors are used for feed on lathes and mills. I am just trying to understand
    how they are controls and work. I did a google for Ohms, and found all kinds
    of things, but nothing explained the relationship between Ohms/KOhms/MOhms.
     
    Red, Sep 3, 2003
    #1
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  2. In article <WLs5b.2$>,
    Red <> wrote:

    > I know Ohms is resistance. What I am trying to figure out is the
    > relationship between an Ohm, a KOhm and a MOhm at the same Wattage.


    The relationship you ask for is an international standard and is
    much simpler that the relationship between quaint units like inches,
    feet, yards, and miles.

    Surf to Google and type in the following search strings:

    1 kiloohm in ohm
    1 megaohm in ohm

    > If I check resistance of a 1 MOhm Linear-Taper Potentiometer (500VDC, 0.5W)
    > with my DMM It starts out with a reading of 01.5 Ohms, and the number rises
    > until somewhere around 3XX.XX Ohms it switches to .3XX KOhms. As I turn it
    > farther the number rises until it gets to about 32X.XX when it switches to
    > .32X MOhms.


    Isn't that clue so large you can't avoid it?

    < http://physics.nist.gov/cuu/Units/prefixes.html >
    < http://physics.nist.gov/cuu/Units/binary.html >

    --
    Göran Larsson http://www.mitt-eget.com/
     
    Goran Larsson, Sep 3, 2003
    #2
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  3. Red

    Tom Guest

    334,000 ohms = 334K ohms = .334M ohms
    To keep your meter from jumping, check to see if you have a button named
    "range hold".


    "Red" <> wrote in message
    news:WLs5b.2$...
    > I know Ohms is resistance. What I am trying to figure out is the
    > relationship between an Ohm, a KOhm and a MOhm at the same Wattage.
    >
    > How many of one does it take to make one of the others?
    >
    > Is 334KOhms the same as .334MOhms at the same wattage? If so then how many
    > Ohms is that?
    >
    > If I check resistance of a 1 MOhm Linear-Taper Potentiometer (500VDC,

    0.5W)
    > with my DMM It starts out with a reading of 01.5 Ohms, and the number

    rises
    > until somewhere around 3XX.XX Ohms it switches to .3XX KOhms. As I turn it
    > farther the number rises until it gets to about 32X.XX when it switches to
    > .32X MOhms.
    >
    > I have looked all through the Machinery's Handbook, and a few Machinist
    > books, but they all deal with mechanical things, though they do concede
    > there is such a thing as electricity and it comes out of a wire. Stepper
    > motors are used for feed on lathes and mills. I am just trying to

    understand
    > how they are controls and work. I did a google for Ohms, and found all

    kinds
    > of things, but nothing explained the relationship between

    Ohms/KOhms/MOhms.
    >
    >
     
    Tom, Sep 3, 2003
    #3
  4. Red

    Red Guest

    Hey guys, thanks a lot. Its just like the metric system. Yes my DMM has a
    Range-Hold button. I guess what really had me going was the fact that the
    multimeter kept switching ranges in the 3's. I would have expected it to go
    up to the 8 or 9's brfore switching ranges. It made me think that
    Ohms/KOhms/MOhms had some off the wall scale.

    Thanks again.
     
    Red, Sep 4, 2003
    #4
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