The following observations were recorded for a metallic resistor at room temperature.
Potential difference V (V): 0.5, 1.0, 1.5, 2.0, 2.5
Current I (A): 0.02, 0.04, 0.06, 0.08, 0.10
Answer the following questions:
(i) Plot a graph of potential difference V on the y-axis against current I on the x-axis using a suitable scale.
(ii) From the nature of the graph, state whether the resistor obeys Ohm’s law and give one reason for your answer.
(iii) What physical quantity does the slope of the V–I graph represent? State its SI unit.