Module 2 :
Lecture 9 : Other Functional Properties of Materials
 


Resistivity of Different Materials

The electrical resistivity (r) of a material is defined as:

r = (R A)/l

Where R is the resistance of the sample, A – the cross-sectional area and l- the length of the sample. The unit of resistivity is Ohm-m.

Material
108 Ω-M
International Annealed Copper Standard
IACS (%)
Cu
1.71
101
Ag
1.59
106
Cu+1%Cd
2.2
80
Gold
2.35
75
Al
2.65
64.9
Brass
6.2
28
Iron
9.7
17.7
Steel
56
3.1
Glass
100
NA
Rubber
100,000
NA
Teflon
1014
NA