Resistivity of some materials are given. Observe the table and answer the questions
Material
Ρ(Ω-m) at 200C
Copper
1.68 x 10-8
Nichrome
1.10 x 10-6
Silicon
6.40 x 102
Germanium
4.60 x 10-1
a) Name the material which is used to make the heating elements of irons,
toasters?
b) Name the materials which are used to make diodes, transistors and
integrated circuits?
Answers
Answer:
really good question sorry but I have no more idea about this
Answer:
Resistivity and Temperature Coefficient at 20 C
Material
Resistivity ρ
(ohm m)
Temperature
coefficient α
per degree C
Conductivity σ
x 107 /Ωm
Ref
Silver
1.59
x10-8
.0038
6.29
3
Copper
1.68
x10-8
.00386
5.95
3
Copper, annealed
1.72
x10-8
.00393
5.81
2
Aluminum
2.65
x10-8
.00429
3.77
1
Tungsten
5.6
x10-8
.0045
1.79
1
Iron
9.71
x10-8
.00651
1.03
1
Platinum
10.6
x10-8
.003927
0.943
1
Manganin
48.2
x10-8
.000002
0.207
1
Lead
22
x10-8
...
0.45
1
Mercury
98
x10-8
.0009
0.10
1
Nichrome
(Ni,Fe,Cr alloy)
100
x10-8
.0004
0.10
1
Constantan
49
x10-8
...
0.20
1
Carbon*
(graphite)
3-60
x10-5
-.0005
...
1
Germanium*
1-500
x10-3
-.05
...
1
Silicon*
0.1-60
...
-.07
...
1
Glass
1-10000
x109
...
...
1
Quartz
(fused)
7.5
x1017
...
...
1
Hard rubber
1-100
x1013
...
...
1
*The resistivity of semiconductors depends strongly on the presence of impurities in the material, a fact which makes them useful in solid state electronics.
References:
1. Giancoli, Douglas C., Physics, 4th Ed, Prentice Hall, (1995).
2. CRC Handbook of Chemistry and Physics, 64th ed.
3. Wikipedia, Electrical resistivity and conductivity.
Resistivity discussion
Resistivity and conductivity of the elements
Index
Tables
Reference
Giancoli
Magnetism Go Back