What type of power does the Battery Bus supply?

The Battery Bus supplies DC power. In aircraft electrical systems, the Battery Bus is typically responsible for providing direct current (DC) that powers essential systems and components when the engines are not running or when there's a loss of other power sources. This is crucial because many avionics and electronic instruments require stable DC power to operate effectively.

In contrast, AC power sources, such as those generated by alternators or generators, are typically used for components requiring higher power loads. Backup power might refer to different configurations or systems used in specific scenarios, but in the context of the Battery Bus, the standard function is to supply DC power. Mixed power would imply a combination of AC and DC being supplied together, which is not characteristic of the Battery Bus function. Understanding this distinction is fundamental for grasping the power supply dynamics in aircraft systems.