The unit of current is known as what?

The unit of current is defined as the Ampere, which is represented by the symbol "A." It quantifies the flow of electric charge in a circuit. Specifically, one Ampere is equivalent to one Coulomb of charge passing through a point in a circuit per second. This unit is foundational in the field of electrical engineering and is critical for understanding how electrical systems function.

Other units mentioned in the options represent different electrical concepts: Joules measure energy, Volts measure electrical potential or voltage, and Ohms measure resistance. Each of these units plays a significant role in circuit analysis, but they do not represent current. Thus, the Ampere stands out as the correct designation for measuring electric current.