Where are the coils or windings located on a DC machine armature?

The coils or windings on a DC machine armature are located in the slots cut into the armature core. This design is crucial for several reasons. The slots provide a dedicated space for the windings, allowing them to be securely mounted while maximizing the surface area available for magnetic interaction. This setup ensures efficient electromagnetic induction, which is essential for the operation of the DC machine.

Having the windings in these slots minimizes the risk of physical damage and allows for better heat dissipation, as the slots can facilitate cooling. The arrangement and positioning of these coils also contribute to the overall efficiency and performance of the motor or generator by optimizing the magnetic field created when current flows through the windings.

The other options do not accurately reflect the standard design of a DC machine armature. For instance, sequences, holes, or bars related to the windings do not align with the recognized engineering principles for how the windings are typically integrated into DC machines.