What component provides direct current to the electrical system in a Cessna 172?

In a Cessna 172, the component that provides direct current (DC) to the electrical system is the alternator. The alternator is responsible for converting mechanical energy into electrical energy, generating the necessary power to keep the aircraft's electrical systems functioning during flight. This includes powering essential systems such as cockpit instruments, lights, and avionics, which require a constant supply of electricity.

Unlike a battery, which stores electrical energy and provides it when needed, the alternator continuously generates electricity while the engine is operating. It typically provides a higher output than a battery alone could supply, ensuring that the aircraft has sufficient power for all of its electrical needs.

In contrast, an inverter converts DC from the battery or alternator into alternating current (AC), and while a generator may be a source of electricity in some older aircraft designs, the Cessna 172 specifically uses an alternator to supply power to its electrical systems in modern versions.