What powers the emergency lights on an aircraft?

Emergency lights on an aircraft are typically powered by rechargeable battery packs. This choice is accurate because these battery packs are specifically designed to provide reliable and independent power to emergency lighting systems in the event of an electrical failure or when the aircraft's main power sources are unavailable. The rechargeable nature of these batteries ensures that they remain charged and ready for use, contributing to passenger safety during emergency situations.

While other options like solar panels, AC power supply, and DC power sources can be related to aircraft systems, they do not specifically serve as the primary power source for emergency lighting. Aircraft emergency lights need a dedicated and reliable source of power that can operate independently of the aircraft's standard electrical systems, which is why the use of rechargeable battery packs is the most appropriate and effective solution.