What is APU?

Hi everyone,

I know this sounds stupid but what is APU and what does it do? Also what is main battery and what does that do?

The APU is a small gas turbine located in the tail or rear section of the aircraft. It uses aviation fuel to generate mechanical power that is converted into electrical. The generated electricity is used to power the aircraft’s electrical systems, such as lights, communication systems, navigation systems, avionics, and other onboard electronic equipment.

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The main battery is exactly what the name says. Turning it on will turn the batteries of the aircraft on therefore providing electrical power to all systems