The following observations were recorded for a constant-length nichrome wire during an experiment to test its obedience to Ohm’s law.
(a) Potential difference V(V) : 1.0, 2.0, 3.0, 4.0, 5.0, 6.0
(b) Current I(A) : 0.10, 0.19, 0.30, 0.39, 0.49, 0.60
(c) (i) Plot a graph of I (y-axis) versus V (x-axis) on a graph sheet using a suitable scale and draw the best-fit straight line through the points.
(d) (ii) From your graph, determine the slope and hence obtain the resistance of the wire.
(e) (iii) Comment on the nature of the graph and state clearly whether the observations confirm Ohm’s law for the wire.
(f) (iv) Identify any two experimental errors that could cause deviation from a perfect straight-line graph and suggest one improvement for each error.