A/C Ground Group II – ERJ Practice Test 2025 – Complete Exam Preparation

The choice identifying batteries, alternators, and buses encompasses the essential components that form the backbone of an aircraft's electrical system. Batteries serve as the primary source of electrical power, especially when the aircraft is on the ground and engines are not running. They also provide backup power in case of generator failure.

Alternators (in this context, commonly referred to as generators) convert mechanical energy from the engines into electrical energy, ensuring a continuous supply of power while the aircraft is in operation. This is crucial for powering the various electrical systems throughout the aircraft.

Buses are critical as they distribute electrical power from the generators to the various components of the aircraft's electrical system, including lights, instruments, and avionics, ensuring that power is efficiently allocated where needed.

Combining these three components provides a comprehensive view of the primary elements that sustain the functionality and safety of the aircraft's electrical system. This understanding is vital for maintenance and operational reliability, emphasizing the importance of each of these components in the overall system.