An unknown resistor was connected to a variable power supply, and the following observations were made:
Voltage V (in V): 2, 4, 6, 8
Current I (in A): 0.40, 0.81, 1.21, 1.59
(a) Plot a graph of V versus I using suitable scales.
(b) Decide from your graph whether the resistor obeys Ohm’s law in the given range of readings. Justify your answer.
(c) Determine the resistance of the resistor from the graph.
(d) Using the resistance found in part (c), calculate the power dissipated in the resistor when the current is 1.5A. Use an appropriate value obtained from your graph to support your calculation.