In a circuit, the graph of potential difference V against current I for a conductor is a straight line that passes through the origin and the point (5V,1A).
(a) Determine the resistance of the conductor.
(b) Find the current that will flow when the potential difference is raised to 12V.
(c) If the conductor is replaced by another of half the resistance, sketch qualitatively on the same set of axes how the new line would appear with respect to the original line.