Here's the breakdown:

* Voltage (V) is a measure of electric potential difference. It represents the work done per unit charge to move a charge between two points in an electric field.

* Joule (J) is the unit of energy.

* Coulomb (C) is the unit of electric charge.

Therefore, 1 Volt is defined as the potential difference between two points where 1 Joule of work is required to move 1 Coulomb of charge from one point to the other.

In other words:

* If you have a 1 Volt battery, it means that for every Coulomb of charge that flows through the battery, 1 Joule of energy is released.

* If you have a circuit with a 1 Volt potential difference, then 1 Joule of work is done to move 1 Coulomb of charge through the circuit.

Key takeaway: Voltage is a measure of energy per unit charge.