Question

What is the S.I unit of potential difference?
${\text{A}}{\text{.}}$ Ohm
${\text{B}}{\text{.}}$ Ampere
${\text{C}}{\text{.}}$ Ohm-meter
${\text{D}}{\text{.}}$ Volt

Answer 1

Hint: Here, we will proceed by defining the term potential difference and then we will provide the general formula to evaluate the potential difference if we are given with the current and the resistance.

Complete step-by-step answer:
Potential difference is defined as the difference in the potential between the two points that represents the work involved or the energy released in the transfer of a unit quantity of electricity from one point to the other.
The potential difference (which is the same as voltage) is equal to the amount of current multiplied by the resistance. A potential difference of one Volt is equal to one Joule of energy being used by one Coulomb of charge when it flows between two points in a circuit.

The formula for the potential difference is given by
Potential difference = Current$ \times $Resistance
i.e., V = I$ \times $R

The S.I units of potential difference is Volt, the S.I unit of current is Ampere and the S.I unit of resistance is Ohm.
Hence, option D is correct.

Note: When we have to measure the potential difference between any two ends of a wire, we can either connect a potentiometer which will give the value of the potential difference in terms of the length between the ends or we can measure the current flowing through the wire with the help of ammeter and the resistance of the wire.