A student records the following readings for a metallic wire kept at constant temperature:
Potential difference (V): 1, 2, 3
Current (A): 0.20, 0.40, 0.60
(i) Using the data, verify whether the wire obeys the relationship between potential difference and current expected for an ohmic conductor.
(ii) Determine the resistance of the wire from the given observations.
(iii) Predict the current that would flow through the wire if a potential difference of 5V were applied, assuming the temperature remains unchanged.
(iv) State any two possible experimental errors that could lead to deviation from the expected relationship in part (i).