Which electrical unit is used to express the difference of potential in a circuit?

The unit that is used to express the difference of potential in a circuit is volts. Voltage, measured in volts, is a critical electrical parameter that indicates the potential energy per unit charge available to drive electric current through a circuit. It represents the "push" that causes electrons to flow, enabling the operation of electrical devices.

In an electrical context, having a clear understanding of voltage is essential, as it affects how devices perform and interact within circuits. When two points in a circuit have a voltage difference, it results in electrical current flowing from the higher potential point to the lower potential one, which is fundamental for the functioning of all electrical systems and components.