The following table gives the value of electrical resistivity of some materials:

Question

(i) The following table gives the value of electrical resistivity of some materials:

Which one of these materials is the best conductor of electricity?
(ii) Two students perform the experiment on series and parallel combinations of two given resistors R₁ and R₂ and plot the following V-I graphs (a) and (b). Which of the graphs is (are) correctly labelled in terms of the words ‘series’ and ‘parallel’? Justify your answer.

Answer 1

(i) Out of these three silver has the lowest resistivity Hence silver is the best conductor of electricity.

As larger resistance represents series combination and smaller resistance the parallel combination. Therefore, graph of greater slope represents series combination and hence it is correctly labelled.

As larger resistance represents series combination, so graph of smaller slope represents series combination and hence it is also correctly labelled.