Which electrical unit measures the rate of flow of electric charge?

The unit that measures the rate of flow of electric charge is the Ampere. An Ampere, often shortened to "Amp," quantifies the amount of electric charge passing a point in a circuit per unit of time. Specifically, one Ampere represents one coulomb of charge moving past a conductor's cross-section in one second. This concept is essential in understanding current flow in electrical systems.

The other units mentioned serve different purposes. The Volt measures electrical potential or voltage, indicating how much potential energy exists to move charges; the Watt is a unit of power that indicates the rate of energy consumption or generation in a circuit; and the Ohm measures resistance, which quantifies how much a material opposes the flow of current. Understanding these distinctions is crucial for grasping the fundamentals of electrical systems.