AC devices are generally not compatible with DC power due to their design, which is optimized for AC efficiency and functionality. While some devices like universal motors, heaters, and filament lamps can operate on DC, many others, such as induction motors and transformers, cannot. The discussion highlights the theoretical efficiency of a DC generator based on the principle of Motional EMF, though practical efficiency is often lower due to factors like friction. The potential for reduced fuel consumption and maintenance in telecommunications is noted, but the feasibility of achieving 100% efficiency remains questioned. Overall, while the concept of a highly efficient DC generator is intriguing, practical applications face significant limitations.