What is the typical voltage of a general aviation aircraft electrical system?

In general aviation aircraft, the standard electrical systems typically operate at 14 or 28 volts DC. These voltage levels are well-suited for the needs of various aircraft systems, such as lighting, avionics, and other electrical components. The choice of DC voltage is particularly beneficial because it simplifies the design of the electrical wiring and enhances the reliability of the system, as DC circuits tend to generate less electromagnetic interference compared to AC circuits.

The 14-volt system is commonly found in smaller general aviation aircraft, while the 28-volt system generally supports larger or more complex aircraft that require additional power capacity. This standardization allows for better compatibility among equipment manufacturers and technicians, ensuring easier maintenance and repairs.

The other voltage levels mentioned in the choices do not align with the typical electrical systems used in general aviation. For example, voltages such as 110 or 220 volts AC are associated with commercial power systems, making them unsuitable for aircraft applications due to their complexity and required transformer systems. Likewise, voltages like 12 or 24 volts AC and 48 or 96 volts DC do not fit within the standard specifications for aviation, reinforcing the correctness of the choice of 14 or 28 volts DC.