What is the SI unit of potential difference between two points in an electrical circuit?
Answer & explanation
Correct answer: option 2
The SI unit of electric potential difference is volt (V), named after Alessandro Volta (1745 –1827), an Italian physicist.
One volt is the potential difference between two points in a current carrying conductor when 1 joule of work is done to move a charge of 1 coulomb from one point to the other.
Therefore,
1 volt = \(\frac{\text{1 joule}}{\text{1 coulomb}}\)
1 V = 1 J C–1
The potential difference is measured by means of an instrument called the voltmeter.