what is the difference between resistance and resistivity?

Asked by  | 31st May, 2011, 05:22: PM

Expert Answer:

 
 
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.

Answered by  | 1st Jun, 2011, 04:27: AM

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