What unit is used to measure electric current?

The unit used to measure electric current is the Ampere. This unit quantifies the flow of electric charge in a circuit, specifically the amount of charge passing a point in a conductor per unit of time. One ampere is defined as one coulomb of charge passing through a given point in one second.

In the context of electrical circuits, understanding current is critical as it plays a pivotal role in determining how devices operate and how they consume power. Current interacts with other electrical units: for instance, voltage (measured in volts) represents the potential difference that drives current, while resistance (measured in ohms) affects the flow of current according to Ohm’s law. Power (measured in watts) is a product of current and voltage, illustrating the relationship between these measurements in electrical systems.

Thus, while other units represent different electrical concepts, the ampere is specifically designated for electric current, making it the correct answer.