What type of electrical system is commonly used in aircraft?

The commonly used electrical system in many aircraft is a 28-volt direct current (DC) system. This system is favored because it strikes a balance between providing adequate power for electrical components and maintaining a manageable weight and size for the wiring and equipment. The 28-volt system is typically employed in smaller general aviation aircraft and many larger aircraft as well, accommodating devices like radios, navigation lights, and other electronic equipment necessary for the safe operation of the aircraft.

A 12-volt alternating current (AC) system is not standard in aircraft electrical systems as it does not provide sufficient power or voltage for the various systems typically required aboard. While some other environments, such as automotive applications, may utilize 12-volt systems, the demands of aircraft systems require a more robust solution.

The 24-volt direct current (DC) system is used in certain aircraft, particularly in larger and more complex systems, but it is not as universally common as the 28-volt system.

Similarly, a 48-volt direct current (DC) system is also not typical in general aviation aircraft. Although higher voltage systems can improve efficiency and reduce wire size, they are not prevalent in general aviation contexts due to challenges in safety and compatibility with existing aircraft