Where does the primary source of power come from for the DC Electrical System?

Where does the primary source of power come from for the DC Electrical System?

• A. AC generators
• B. Batteries
• C. DC Converters
• D. APU

Answer: (C)

Power for the DC electrical system comes from converting the generators’ output into a stable DC supply. The engines drive generators that produce AC power, and DC converters (rectifiers) take that AC and convert it to the 28 V DC used by the DC bus and loads. Batteries and the APU can supply power in specific situations (starting, emergencies, or when generators aren’t available), but they aren’t the primary source when the engines are running. So the DC converters are the main source because they provide the conditioned DC power the system relies on.

Power for the DC electrical system comes from converting the generators’ output into a stable DC supply. The engines drive generators that produce AC power, and DC converters (rectifiers) take that AC and convert it to the 28 V DC used by the DC bus and loads. Batteries and the APU can supply power in specific situations (starting, emergencies, or when generators aren’t available), but they aren’t the primary source when the engines are running. So the DC converters are the main source because they provide the conditioned DC power the system relies on.