Draw V-I graph for ohmic and non-ohmic materials. Give one example for each.

Explanation

V - I graph for ohmic material is shown in Fig.
Example : Copper wire, nichrome, aluminium etc.
V-I graph for non-ohmic material is as shown in Fig.(a) and (b). It can have any shape other than a straight line passing through the origin.
Example : Junction diode, transistor, fluorescent tube etc.