The electrical resistivities of five substances A, B, C, D and E are given below :
A) 5.20 x 10-8 Ω m
B) 2.60 x 10-8 Ω m
C) 10.0 x 10-8 Ω m
D) 1.70 x 10-8 Ω m
(a) Which substance is the best conductor of electricity? Why?
(b) Which one is 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?
(a) E is the 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 highest electrical resistivity
(d) C and E, because of their low electrical resistivities.