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What is the potential difference ? Explain and give its unit with definition.

Answer
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Hint: Potential difference is the difference in the amount of energy that charge carriers have between two points in a circuit. Potential difference (p.d.) is measured in volts (V) and is also called voltage.

Complete answer:
The work required to transfer a charge from one point to another is described as potential difference. For a charge to pass between two points, there must be a potential difference in current. The potential energy difference per unit charge or voltage is another term for it. The Volt is the unit of potential difference (V).

We can also say that the amount of work required to move a unit positive charge from one point to another is described as a potential difference.
1 Joule/Coulomb = 1 Volt
The volt is the SI unit for potential difference(V) . 1 volt = The potential difference between two points in a current carrying conductor when 1 joule of work is performed to transfer a charge of 1 coulomb from one point to the other.

Note: 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.
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