What function does an inverter serve in an aircraft's electrical system?

An inverter in an aircraft's electrical system is designed specifically to convert direct current (DC) into alternating current (AC). This process is crucial because many aircraft systems and equipment require AC power for their operation, such as motors and certain types of lighting systems. By transforming DC, which is typically supplied from batteries or DC generators, into AC, the inverter enables these systems to function effectively.

The other functions listed do not correctly describe the role of an inverter. Reducing voltage, increasing current, or disconnecting the battery during charging are tasks managed by different components in the aircraft's electrical system, such as transformers or circuit breakers and control relays. Thus, the inverter’s primary and essential role in the context of an aircraft's electrical system is accurately captured by the conversion of DC to AC power.