What is formed by the passage of an electric current across a space between conductors?

The formation of an electrical arc is a phenomenon that occurs when electric current passes through an air gap or space between two conductors. This happens when the voltage is high enough to overcome the dielectric strength of the air, effectively creating a conductive pathway that allows the current to flow. The arc is characterized by a bright, visible light and can be accompanied by a loud burst of sound, as well as heat; it often appears in situations like short circuits or equipment malfunctions.

An electrical circuit refers to a complete path through which current can flow, incorporating components like source, load, and conductors, rather than focusing on the effect of current passing through a gap. Static charge refers to the accumulation of electric charge on a surface, typically without current flow; it does not describe a dynamic process involving a gap. A conductor bridge implies a physical connection between conductors, which would not specifically indicate the formation of an arc across a space but rather suggest direct electrical contact. Thus, the correct choice regarding what is formed by the passage of an electric current across an air gap is indeed the electrical arc.