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

  • #1
What is the name of the device used to measure ohms? :confused:
 

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  • #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...
 
  • #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.
 
  • #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.
 
  • #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.
 
  • #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:
 
  • #7
dextercioby
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No,not directly.The ratio is (length/area) (times resistivity,see above).So mass is involved indirectly.

Daniel.
 
  • #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?
 
  • #9
dextercioby
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Of course.Internal structure is the key...Quantum Mechanics and Transport Phenomena give all the answers/explanations.


Daniel.
 
  • #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?
 
  • #11
Integral
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Yes, an ohmmeter must be powered.
 

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