# Difference between Resistance and resistivity

1. Sep 13, 2009

### SpartanG345

What is the difference between these 2 quantities?

from my text book defines resistivity as a specific property of a material
and is = E/J

where the resistance is the resistivity over a unit length and area. So I suppose the resistance is a measures of resistivity over a volume

Resistance = pL/A

thats what i think but i am not sure if i am right

PS i am sorry if this is a noob question, but my answer differed by one provided on yahoo answers, but then again yahoo answers is only yahoo answers( i got worried)

2. Sep 13, 2009

### Staff: Mentor

This is what you need. Resistance of a piece of material is proportional to its length and inversely proportional to its area. The proportionality constant p is called the resistivity, which is a property of the kind of material.

Last edited by a moderator: Apr 24, 2017
3. Sep 13, 2009

### Staff: Mentor

Resistance is a property of a device and resistivity is a property of a material. For a mechanical analogue you might think of the difference in strength between a piece of aluminum foil and an aluminum baseball bat. They are both made out of aluminum, so they both have the same Young's modulus, but they are shaped differently so they have different stiffness.

4. Sep 13, 2009