What is the difference between resistance and resistivity

 

 

Ans-

 

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 opf cross section.