What is the primary function of a DC generator?

The primary function of a DC generator is to create a direct current, which flows in one direction. This is achieved through the use of a split ring commutator system. The commutator is responsible for reversing the current direction every half rotation, ensuring that the output remains unidirectional. As the mechanical energy is converted into electrical energy, the design of the split ring allows for a consistent flow of current, enabling the generator to provide a stable voltage output in the form of DC.

In contrast, other options suggest functions not aligned with the characteristics of a DC generator. For example, using a slip ring system would typically be associated with an AC generator, as slip rings keep the current alternating. Converting mechanical energy into alternating current is a function of AC generators rather than DC generators. Lastly, while increasing voltage is a function of transformers, a generator itself does not inherently increase voltage; instead, it produces electrical energy based on the input mechanical energy.