Question

Is the V-I graph always a straight line ? if not , give 2 examples on such materials​

Answer 1

Answer:

In electrical terms, it is said that if the V-I characteristics of a material is a straight line passing through the origin then it is said to be an ohmic conductor.

In that case, the conductor obeys Ohms Law. i.e, V is directly proportional to I. V=IR

Answer 2

Answer:

Hence vt graphs are not always straight..