(a) State the relation correlating the electric current flowing in a conductor and the voltage applied across it. Also, draw a graph to show this relationship.
(b) Find the resistance of a conductor if the electric current flowing through it is 0.35 A when the potential difference across it is 1.4 V.
(a) If the physical conditions in a conductor remain unchanged (such as temperature), then the potential difference across the two ends of a conductor is directly proportional to the electric current flowing through it. Below diagram depicts the relation between potential and current,
(b) we know that V=IR, Therefore,
R= 1.4÷0.35= 4 Ohm