How to calculate resistance between two electrodes filled with water

[guptasuryakant]

Hello ,

Can someone from this group help me ,how to calculate resistance between two electrodes filled with water with a known conductivity solution.

In my case I have two experimental conditions. First there are two rectangular plates separated with a gap of 30 mm.

In second case this is a cylindrical geometry Innner electrode dia is 10 mm. And outer electrode dia is 50 mm. In between water is filled with a conductivity of 500µ cm/cm.

If some one can answer atleast for one case it will be useful for me.

regards

 

[berkeman]

For the rectangular case, the resistance is

$$R = \frac{\rho L}{A}$$

Where A is the crossectional area, and the resistivity is $$\rho$$

The calculation is similar for the cylindrical geometry, but you need to set up an integral to do it over small volume elements that approximate the rectangular situation.

 

[berkeman]

Here's the wiki on resisitivity from wikipedia.org:

http://en.wikipedia.org/wiki/Resistivity

 

[guptasuryakant]

How I can put the value in place of resistivity

Thanks for your prompt reply

How I can put the value in place of resistivity in above fourmula

 

[berkeman]

You said you knew the conductivity of the solution. Probably conductivity and resistivity are just inverses, but check the units to be sure.