What is the basic unit of electrical current in the SI system?

The basic unit of electrical current in the International System of Units (SI) is the Ampere. This unit measures the flow of electric charge in a circuit. Specifically, one Ampere is defined as the flow of one coulomb of charge per second. Understanding this unit is essential for power engineers, as it directly relates to the operation and management of electrical systems.

The other choices—metre, kilograms, and seconds—represent different fundamental units used in the SI system. The metre provides a measure of length, kilograms measure mass, and seconds are used for time. Each of these is crucial in their respective contexts, but they do not pertain to electric current. In dealing with electrical engineering and power systems, recognizing the importance of current, represented by the Ampere, is fundamental to understanding how electrical energy is generated, distributed, and consumed.