The resistivities of copper and silver are 1.68×10-6Ωcm and 1.59×10-6Ωcm respectively. Which of the two is a better electrical conductor and why?
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 advise to be used for making heating elements of electric irons? Why? (d) Which two substances should be used for making electric wires ? Why?
(a) Give two examples of substances which are good conductors of electricity. Why do you think they are good conductors of electricity? (b) Calculate the resistance of a copper wire 1.0 km long and 0.50 mm diameter if the resistivity of copper is 1.7×10−8Ωm.
Judge the equivalent resistance when the following are connected in parallel − (a) 1 Ω and 106Ω, (b) 1 Ω and 103Ω and 106Ω.