The document discusses the construction and working principles of a simple DC generator. It explains that a rotating coil inside a magnetic field will generate an alternating current in the coil. To make the output current unidirectional, slip rings are replaced with a split-ring commutator. The commutator has two segments that are insulated from each other and connected to the coil ends. As the coil rotates, the commutator reverses the direction of the current flow, rectifying it to produce a unidirectional current in the external circuit. An actual DC generator consists of additional key components like magnetic poles, field coils, an armature core and windings, commutator, and brushes to generate a steady direct