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Question - Factors on Which the Resistance of a Conductor Depends

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ConceptFactors on Which the Resistance of a Conductor Depends  

Question

Use the data in Table 12.2 to answer the following –
Table 12.2 Electrical resistivity of some substances at 20°C

MaterialResistivity (Ω m)
ConductorsSilver1.60 × 10−8
Copper1.62 × 10−8
Aluminium2.63 × 10−8
Tungsten5.20 × 10−8
Nickel6.84 × 10−8
Iron10.0 × 10−8
Chromium12.9 × 10−8
Mercury94.0 × 10−8
Manganese1.84 × 10−6
Constantan
(alloy of Cu and Ni)
49 × 10−6
AlloysManganin
(alloy of Cu, Mn and Ni)
44 × 10−6
Nichrome
(alloy of Ni, Cr, Mn and Fe)
100 × 10−6
Glass1010 − 1014
InsulatorsHard rubber1013 − 1016
Ebonite1015 − 1017
Diamond1012 − 1013
Paper (dry)1012

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