# Resitivity, the Ohm metre

1. Aug 1, 2014

### davenn

I just need a clarification, I have been through a dozen www sites and cannot find an answer

they show how resistivity is worked out eg ....

the Ohm meter is usually shown with a "dot" between Ohm and metre
Is this the same as Ohm times metre ? or Ohms per metre or something else?

I would have thought that Ohms per metre would be Ohms/metre ?

cheers
Dave

Last edited: Aug 1, 2014
2. Aug 1, 2014

### Drakkith

Staff Emeritus
I don't think it's ohm x meter, as it doesn't make sense that way. It looks to me like it's just convention based on the units used to derive it.

3. Aug 1, 2014

### milesyoung

It's ohm x meter, otherwise the dimensions of the units wouldn't make sense for your first equation, i.e:

E/J [V/m/(A/m^2) = V/A*m = Ω*m]

4. Aug 1, 2014

### Drakkith

Staff Emeritus
Hmm. Guess I must have misunderstood the math. Whoops.

5. Aug 1, 2014

### davenn

That's OK Drak you probably still had a better grasp than me

thanks milesyoung

appreciate the clarification. It was something that wasn't taught in my electronics classes many years ago

and if I was ... refer to my signature

Dave

Last edited: Aug 1, 2014