What is the purpose of the aircraft's electrical system and generator/alternator?

• A. To drive the propeller and control pitch.
• B. To provide electrical power for systems and recharge the battery.
• C. To measure fuel quantity.
• D. To provide hydraulic pressure for landing gear.

Answer: (B)

The main idea is that the electrical system and the generator/alternator exist to supply power to all onboard electrical loads and to keep the battery charged. The generator (or alternator) converts engine power into electricity, keeping the aircraft’s electrical system energized during flight. The battery provides starting power and serves as a backup power source if the generator can’t supply power or during initial start-up. With proper electrical power, you can run avionics, instruments, lights, radios, and other systems, and the battery helps ensure you have emergency or limited-use power if the generator fails.