What type of system provides electrical power in the Cessna 172?

The Cessna 172 is equipped with a 28-volt electrical system powered by an alternator. This system is designed to provide a higher voltage than a 14-volt or 12-volt system, which enhances the efficiency of power distribution to various electrical components in the aircraft. The 28-volt system helps in reducing the size of wiring needed to transmit power while allowing for lower current draw, which is beneficial for handling larger electrical loads such as radios, lights, and other instruments critical for flight operations.

The fact that it is powered by an alternator rather than a generator is also significant, as alternators are generally more efficient than generators and provide consistent voltage and current output, even at different engine speeds. This reliability is crucial for the operation of essential instruments and avionics during flight.