Tue May 31, 2011 By:

what is the difference between resistance and resistivity?

Expert Reply
Wed June 01, 2011
Ohm's law tell us that resistivity of a material is independent of the electric field existing in the material. This is valid for conductors over a wide range of field. And it is denoted by
 , where  is resistivity and  conductivity. 
The unit of resistinity  is ohm-metre.
Resistance of a conductor means ability to block the flow of current in the conductor and it is written as 
Wher R is the resistance where its unit is Ohm, l is the length of the conductor and A is the area of cross section.
Ask the Expert