A teacher asked a group of students to complete the following partially recorded data while verifying Ohm’s law. Some potential-difference readings are missing.
Current I (A): 0.15, 0.30, 0.45, 0.60, 0.75
Potential difference V (V): — , 1.8, — , 3.6, 4.5
Attempt all parts.
(a) Assuming that the conductor used is ohmic, fill in the two missing values of potential difference.
(b) Compute the resistance for each of the five complete readings obtained after part (a).
(c) Calculate the mean resistance of the conductor and compare it with the resistance obtained from any single reading; comment on the consistency of the values.
(d) If the class drew a V–I graph for this data, what would be the expected shape and why? State any one conclusion that can be drawn from the slope of the graph.