Passage: To make a measurement, a current is caused to flow along one edge of the sample (for instance, I12) and the voltage across the opposite edge (in this case, V34) is measured. From these two values, a resistance (for this example,

Question: What two values are needed to make a measurement for resistance?
a current is caused to flow along one edge of the sample (for instance, I12) and the voltage across the opposite edge