Observe the following table. Which of the material can be used for transmission of electricity, heating material and insulator, and why ?
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The electrical resistivities of five substances A, B, C, D and E are given below:
A=5.20×10
−8
Ωm
B=110×10
−8
Ωm
C=2.60×10
−8
Ωm
D=10.0×10
−8
Ωm
E=1.70×10
−8
Ωm
(a) Which substance is the best conductor of electricity? Why?
(b) Which one is a better conductor: A or C? Why?
(c) Which substance would you advice to be used for making heating elements of electric irons? Why?
(d) Which two substances should be used for making electric wires? Why?
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(a) E is best conductor of electricity due to its least electrical resistivity.
(b) C , because its resistivity is lesser than that of A.
(c) B , because it has the highest electrical resistivity.
(d) C and E , because of their low electrical resistivities.
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