Which of the following is a unit of electrical current?

The unit of electrical current is the ampere, commonly abbreviated as "amp." The ampere measures the flow of electric charge in a circuit. When a current of one ampere flows through a conductor, it means that one coulomb of charge is passing through a given point in the conductor per second. This fundamental concept is critical in understanding electrical systems, as current is essential for the operation of electrical components and circuits.

In contrast, ohms, volts, and watts represent different electrical properties: ohms are the unit of resistance, volts refer to electrical potential or voltage, and watts measure electrical power. Each of these units plays a distinct role in electrical engineering and circuit analysis but does not define the flow of electric current directly like the ampere does. Understanding these units and their relationships is crucial for an aspiring aircraft electronics technician to work effectively with electronic systems in aircraft.