(a) When the current is 0.5 A, the potential difference is 1.25 V.
(b) When the potential difference is 0.75 V, current is 0.3 A.
(c) Because the graph is linear, resistance may be calculated from any value in the table.
Given V = 2.5 Volt
So
I = 1.0 amp
Ohm’s law states:
R = V / I
R = 2.5 / 1.0
Therefore,
R = 2.5 Ohm