TABLE 26.2 Resistivities and Temperature Coefficients of Resistivity for Various Materials Temperature Coefficient a [(°C)-'] Material Resistivitya (N • m) Silver 1.59 X 10-8 3.8 × 10-3 1.7 × 10-8 3.9 X 10-3 Соpper Gold 2.44 X 10-8 3.4 X 10-3 Aluminum 2.82 × 10-8 3.9 X 10-3 Tungsten 5.6 X 10-8 4.5 X 10-3 Iron 10 X 10-8 5.0 X 10-3 Platinum 11 X 10-8 3.92 X 10-3 Lead 22 X 10-8 3.9 X 10-3 1.00 X 10-6 3.5 X 10-5 Nichrome 0.4 X 10-3 Carbon -0.5 × 10-3 Germanium 0.46 -48 X 10-3 Silicond 2.3 × 103 1010 to 1014 -75 X 10-3 Glass Hard rubber 1013 Sulfur 1015 Quartz (fused) 75 X 1016 * All values at 20°C. All elements in this table are assumed to be free of impurities. b See Section 26.4. CA nickel-chromium alloy commonly used in heating elements. The resistivity of Nichrome varies with composition and ranges between 1.00 x 10-6 and 1.50 × 10-6N · m. d The resistivity of silicon is very sensitive to purity. The value can be changed by several orders of magnitude when it is doped with other atoms.

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Chapter27: Current And Resistance
Section: Chapter Questions
Problem 27.73AP
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A wire 50.0 m long and 2.00 mm in diameter is connected to a source with a potential difference of 9.11 V, and the current is found to be 36.0 A. Assume a temperature of 20.0°C and, using the given table, identify the metal out of which the wire is made.

TABLE 26.2 Resistivities and Temperature Coefficients of Resistivity
for Various Materials
Temperature
Coefficient a [(°C)-']
Material
Resistivitya (N • m)
Silver
1.59 X 10-8
3.8 × 10-3
1.7 × 10-8
3.9 X 10-3
Соpper
Gold
2.44 X 10-8
3.4 X 10-3
Aluminum
2.82 × 10-8
3.9 X 10-3
Tungsten
5.6 X 10-8
4.5 X 10-3
Iron
10 X 10-8
5.0 X 10-3
Platinum
11 X 10-8
3.92 X 10-3
Lead
22 X 10-8
3.9 X 10-3
1.00 X 10-6
3.5 X 10-5
Nichrome
0.4 X 10-3
Carbon
-0.5 × 10-3
Germanium
0.46
-48 X 10-3
Silicond
2.3 × 103
1010 to 1014
-75 X 10-3
Glass
Hard rubber
1013
Sulfur
1015
Quartz (fused)
75 X 1016
* All values at 20°C. All elements in this table are assumed to be free of impurities.
b See Section 26.4.
CA nickel-chromium alloy commonly used in heating elements. The resistivity of Nichrome
varies with composition and ranges between 1.00 x 10-6 and 1.50 × 10-6N · m.
d The resistivity of silicon is very sensitive to purity. The value can be changed by several
orders of magnitude when it is doped with other atoms.
Transcribed Image Text:TABLE 26.2 Resistivities and Temperature Coefficients of Resistivity for Various Materials Temperature Coefficient a [(°C)-'] Material Resistivitya (N • m) Silver 1.59 X 10-8 3.8 × 10-3 1.7 × 10-8 3.9 X 10-3 Соpper Gold 2.44 X 10-8 3.4 X 10-3 Aluminum 2.82 × 10-8 3.9 X 10-3 Tungsten 5.6 X 10-8 4.5 X 10-3 Iron 10 X 10-8 5.0 X 10-3 Platinum 11 X 10-8 3.92 X 10-3 Lead 22 X 10-8 3.9 X 10-3 1.00 X 10-6 3.5 X 10-5 Nichrome 0.4 X 10-3 Carbon -0.5 × 10-3 Germanium 0.46 -48 X 10-3 Silicond 2.3 × 103 1010 to 1014 -75 X 10-3 Glass Hard rubber 1013 Sulfur 1015 Quartz (fused) 75 X 1016 * All values at 20°C. All elements in this table are assumed to be free of impurities. b See Section 26.4. CA nickel-chromium alloy commonly used in heating elements. The resistivity of Nichrome varies with composition and ranges between 1.00 x 10-6 and 1.50 × 10-6N · m. d The resistivity of silicon is very sensitive to purity. The value can be changed by several orders of magnitude when it is doped with other atoms.
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