Energy conversion devices are an important element of progress of society. Understanding their limitations and efficiencies is vital to our energy-informed and energy-conscious society. The ideal, simple, and basic power cycles of Carnot Cycle, Brayton Cycle, Otto Cycle, and Diesel Cycle, the ideal power cycle components and processes of compression, combustion, and expansion, and the ideal compressible flow components of subsonic nozzle, diffuser, and thrust are presented in this 4-hour online course. In the presented power cycles, power cycle components and processes, and compressible flow analysis, air is used as the working fluid.