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Transcribed Image Text:Resistivities at 20°C
Material
Aluminum
Copper
Gold
Nichrome
Silver
Tungsten
Resistivity (2 m)
2.82 × 10-8
1.72 × 10-8
2.44 x 10-8
150. × 10-8
1.59 × 10-8
5.60 × 10-8
Resistivity (ρ) Ωm
Aluminum
2.82 x 10-8
1.72 x 10-8
Copper
Silver
1.59 x 10-8
Carbon
3.5 x 10-5
Teflon
1 x 1016
Rubber (hard)
10131016
30 x 1010
Maple wood
Silicon
20-2300
4. A 200 m long aluminum wire has the same resistance and cross-sectional
area as a carbon wire. What is the length of the carbon wire?
Given:
Find:
Formula:
Substitution:
Solution
Material
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