Question

Resistivity of some materials are given below. (Units = W-m)
Silver
1.59 % 10%
Lead
2.20 x 10-7
Copper
168 x 10-8
Carbon
2.50 x 10
Gold
2.44 x 10-8
Water
2.00 x 10
Aluminium
2.82 x 10-
Glass
10.0 x 1010
Tumgsten
5.6 x 10-8
Rubber
10 x 1013
Tron
1.0 x 10-7
Air
1.3 x 1016
a) Write any two good solid insulators.
b) Write any two good solid conductors.
c) Which one has the low melting point among the given materials ?
d) Silver and gold are not used in the household electrical wiring. Why?​

Answer 1

• Glass , water ( actually salty water conducts is conductor but pure water is insulator)
• copper , aluminium
• water
• Silver and gold are not used in household electrical wiring because they are expensive and rare.

Also they cannot conduct electricity as much better as copper .

• #Komal Agarwal
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