An Iron wire at 0 Celcius has resistivity Ro. At which temperature the resistiv-ity of this wire will be 1.2R9. You can find the value temperature coefficientsof resistivity from Table 25.2 from your book. Explain the physical mechanismof rising resistivity by the rising temperature. Temperature Coefficients of ResistivityTABLE 25.2 (Approximate Values Near Room Temperature)Materiala [(*C)-!]Materiala [(*C)-']0.00390.0020AluminumLead0.0043ManganinMercuryBrass0.00000Carbon (graphite)-0.00050.00088Constantan0.00001Nichrome0.0004CopperIron0.003930.0050Silver0.0038Tungsten0.0045

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An Iron wire at 0 Celcius has resistivity Ro. At which temperature the resistiv- ity of this wire will be 1.2R9. You can find the value temperature coefficients of resistivity from Table 25.2 from your book. Explain the physical mechanism of rising resistivity by the rising temperature.

An Iron wire at 0 Celcius has resistivity Ro. At which temperature the resistiv- ity of this wire will be 1.2R9. You can find the value temperature coefficients of resistivity from Table 25.2 from your book. Explain the physical mechanism of rising resistivity by the rising temperature.

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Concept explainers

Temperature Variance of Resistance

Electrical resistance or simply resistance is the property of a material that opposes the free flow of electrons through it. The total amount of resistance to the flow of charges (or current) is affected by many factors like the length of the conducting material, its cross-sectional area, resistivity, and temperature.

Question

An Iron wire at 0 Celcius has resistivity Ro. At which temperature the resistiv-
ity of this wire will be 1.2R9. You can find the value temperature coefficients
of resistivity from Table 25.2 from your book. Explain the physical mechanism
of rising resistivity by the rising temperature.

Temperature Coefficients of Resistivity
TABLE 25.2 (Approximate Values Near Room Temperature)
Material
a [(*C)-!]
Material
a [(*C)-']
0.0039
0.0020
Aluminum
Lead
0.0043
Manganin
Mercury
Brass
0.00000
Carbon (graphite)
-0.0005
0.00088
Constantan
0.00001
Nichrome
0.0004
Copper
Iron
0.00393
0.0050
Silver
0.0038
Tungsten
0.0045

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