Sacramento has alternators and generators for sale. An alternator is a device that can generate power by the movement of parts. The voltage and the output of power can be variable and can be controlled. The current, generated in DC, can be converted to AC before being used in the car. This is done by a commutator. Alternators are used in cars for charging the battery and the headlights. These are available for sale in Sacramento. A generator is a device converting mechanical energy to electrical energy. Some sources for the mechanical energy can be a reciprocating or turbine steam engine, water falling through a turbine or waterwheel, an internal combustion engine, a wind turbine, a hand crank, and many more. Generators can be of various power outputs and models. They can be bought in Sacramento.