Which of the following instruments is used to measure the potential difference in an electric circuit?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Voltmeter
Potential difference is measured with a voltmeter, connected in parallel across the two points between which it is to be measured. Its reading is in volts.
Why the other options are incorrect
Option (1) Ammeter — Incorrect. An ammeter measures electric current and is connected in series.
Option (2) Galvanometer — Incorrect. A galvanometer detects a small current and its direction in a circuit.
Option (4) None of these — Incorrect. The voltmeter, in Option (3), does this.