What type of power is provided by a rotary inverter?

A rotary inverter is a device that converts direct current (DC) into alternating current (AC). The specific function of a rotary inverter is to produce a stable AC output that can be utilized for various electrical loads aboard aircraft or other applications.

In this context, the rotary inverter typically provides power at 115 volts alternating current, which is the standard voltage used in many aircraft systems for lighting, equipment, and instrumentation. This voltage level is critical for ensuring compatibility with the electrical systems that require AC power for operation.

While other power types listed in the options pertain to different aspects of electrical systems, they do not relate to the function of a rotary inverter in the same way. For instance, 12 volts direct current refers to a common voltage for low-power systems, 230 volts three-phase power is not typically associated with aviation, and 400 volts direct current is not standard in the context of rotary inverters in aircraft. Thus, 115 volts alternating current is the correct and relevant output of a rotary inverter in aviation contexts.