What do Emergency DC Buses receive power from?

Emergency DC Buses receive power from transformer rectifiers, which convert alternating current (AC) to direct current (DC) and supply power to the emergency systems on the aircraft. This function is critical during flight, especially in power loss scenarios or emergencies, where maintaining essential systems' operation is vital for safety.

Transformer rectifiers are designed to ensure that even when the main power sources are compromised, there is a backup supply of DC power that can sustain critical functions like navigation, communication, and certain flight control systems. The reliability of transformer rectifiers in converting and supplying power makes them an integral part of modern aircraft electrical systems, particularly when dealing with emergency protocols.

Other options, while related to aircraft power systems, do not align with the specific role that emergency DC Buses serve in providing immediate, reliable power during critical situations. For instance, while batteries can supply power, they are typically not the direct source for the emergency DC Buses in a sustained manner, as their capacity is limited. Ground power units are used while on the ground for servicing, and solar panels, though innovative, are not standard sources for emergency DC Buses in most aircraft.