Question

What happens to the current if the potential difference across the ends of a conductor is (a)doubled, (b) halved,(c)tripled? What is the nature of the graph drawn between potential difference and corresponding current readings in the verification of Ohm’s law?

Answer 1

If the potential difference across the conductor is
(a) doubled, (b) halved and (c) tripled, then the current through the conductor is (a) doubled, (b) halved and (c) tripled respectively as well, since the resistance of a circuit is a constant that depends on the length, thickness and material of the wire and is independent of the potential difference across it.

The graph of all these three phenomenon will be three coordinates on a straight line with a constant slope, the inverse of which gives the value of the resistance.