Abstract. The electrical system is one of the main components of the aircraft, most of the systems and components of which are powered by electricity. The electrical system of an airplane can be compared to the human nervous system, without electricity, organs and body parts would not function. However, in case of such an emergency, the aircraft is equipped with a battery that can power the aircraft for 30
minutes – the maximum time until an alternative airport is found and the aircraft cannot land.

Key words: electrical system, battery, alternating current, generator, batteries