CBSE Class 12-science Answered
Kindly refer to page 104 of your Ncert text book part I. In an ohmic resistor the resistivity remains constant with temperature. So the graph will be a straight line parallel to the x axis.
In a metallic resistor like copper, with increase in temperature the resistivity increases.
In case of a super conductor at temperatures below a certain critical temperature the resistivity is zero, as temp increases, the resistivity increases.
This video explains the concept of electric current.
This video explain the drift speed and its dependence on the externally app...
Compare the resistivity of conductors, insulators and semiconductors. Study...
Define emf, potential difference & internal resistance. Identify factors on...
This video describes about the working of cells in series combination.