In aircraft electrical systems, what is typically the main source of power?

The main source of power in aircraft electrical systems is typically the generator. Generators convert mechanical energy into electrical energy, enabling the aircraft to operate a variety of systems and equipment during flight. In commercial and larger aircraft, the generators are usually driven by the engines and are designed to produce substantial power output needed for critical systems, including avionics, lights, and motors.

While batteries serve as a vital backup power source and can support systems during engine start-up or in emergency situations, they are not sufficient to meet the continuous power requirements of most operational phases. Fuel cells and solar panels are alternative energy sources that are being explored, but they are not the primary power sources in conventional aircraft electrical systems. Fuel cells may provide clean energy and solar panels can contribute to energy needs, but their use is limited in current aircraft designs. Therefore, the generator stands out as the cornerstone of the aircraft's electrical power system under normal operating conditions.