Which one of the following is not a measurable quantity ?

Question

G1 Physics · Accepted Answer

A potential difference between two points can be measured directly with a voltmeter. Resistance can also be measured. Displacement current can be inferred from measurable electromagnetic quantities. However, absolute electric potential at a point is defined only relative to a chosen reference potential. Therefore, in the sense intended by the question, 'voltage' meaning absolute potential is not directly measurable without specifying a reference. Correct option: C.