Which of the following instruments is used to measure potential difference in an electrical circuit?

Voltmeter

The electric potential difference between two points in an electric circuit carrying some current as the work done to move a unit charge from one point to the other.

V = \(\frac{W}{Q}\)

The SI unit of electric potential difference is volt (V).

The potential difference is measured by means of an instrument called the voltmeter. The voltmeter is always connected in parallel across the points between which the potential difference is to be measured.