Final answer:
During an electrical emergency, the Central DC bus is powered by batteries to ensure a continuous supply of electricity to critical components.
Step-by-step explanation:
The Central DC bus in electrical systems is typically powered by batteries during an electrical emergency. This is because batteries serve as a backup power source, providing electricity when the main power source fails. In the event of an electrical emergency, such as a power outage or failure in the wired system, the batteries kick in to ensure continuity of power supply to critical components of the system.