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What is the name of the device used to measure ohms?

  1. Mar 5, 2005 #1
    What is the name of the device used to measure ohms? :confused:
     
  2. jcsd
  3. Mar 5, 2005 #2

    dextercioby

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    With a multimeter,you can measure both tension & current,ergo determine resistence...

    Daniel.


    EDIT:I suspect a tool only for resistence would be called OHMMETER...
     
  4. Mar 5, 2005 #3
    I need to be sure that it's called an ohmmeter though. I don't want to introduce to many calculations into my experiment, as it's only supposed to focus on how a wire's length, shape, mass, thickness, and material affect its resistance.
     
  5. Mar 5, 2005 #4

    dextercioby

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    It's not too many calculations,just a division V/I.In case you lack the ohmmeter.

    [tex] R=\rho\frac{l}{S} [/tex]

    Is this what you're looking for...?

    Daniel.
     
  6. Mar 5, 2005 #5

    dextercioby

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    Oh,and one more thing:I'm pretty sure that the ohmmeter used Ohm's law (!) to determine the resistance and doing that by performing the division,insted of you...:wink:

    Daniel.
     
  7. Mar 5, 2005 #6
    Ahhh...I found an ohmmeter, and yes, it does use Ohm's Law.

    Thank you for your help!

    Also, do you know how a wire's mass would affect its resistance? I'd assume more massive wires would be less resistant... :confused:
     
  8. Mar 5, 2005 #7

    dextercioby

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    No,not directly.The ratio is (length/area) (times resistivity,see above).So mass is involved indirectly.

    Daniel.
     
  9. Mar 5, 2005 #8
    Okay. Also, why do electrons move faster and more effeciently through metals than nonmetals? What are the characteristics of a good conductor? Does it have something to do with the way the atoms or molecules of a substance are arranged?
     
  10. Mar 5, 2005 #9

    dextercioby

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    Of course.Internal structure is the key...Quantum Mechanics and Transport Phenomena give all the answers/explanations.


    Daniel.
     
  11. Mar 5, 2005 #10
    One more thing before I go, does the ohmmeter require electricity to be running through a wire to take its measurements, or does it test the material directly?
     
  12. Mar 5, 2005 #11

    Integral

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    Yes, an ohmmeter must be powered.
     
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