Which of the following are typical components of an aircraft electrical system in a small airplane?

• A. Battery, alternator, voltage regulator, distribution buses, wiring, and fuses.
• B. Battery, hydraulic pump, fuel pump, and altimeter.
• C. Battery, solar panels, wind vane, and gyros.
• D. Generator only, with no regulator or buses.

Answer: (A)

In a small airplane, electrical power is managed through a simple chain: energy storage, in-flight generation, voltage control, power distribution, and overcurrent protection. The combination of a battery for stored energy, an in-flight generator (alternator) to supply power while running, a voltage regulator to keep system voltage steady as engine speed and electrical load change, distribution buses to route power to all circuits, and wiring to connect everything, with fuses to protect the circuits, forms a complete and typical electrical system. This setup covers how power is produced, controlled, and safely delivered to lights, avionics, and other equipment.

The other options mix in parts from other systems or omit essential electrical-system pieces. Hydraulic and fuel pumps belong to their respective systems, not the electrical distribution network. An altimeter is an instrument that may use electrical power, but it isn’t a fundamental component of the electrical power system itself. Solar panels and wind vanes are not standard components of a typical small airplane’s electrical system, and while gyros are powered instruments, they’re not the core components that generate, regulate, and distribute electrical power. A generator by itself, without a regulator and distribution, wouldn’t provide a safe, usable electrical system.