The key difference between the Otto engine and the Carnot engine lies in their thermodynamic cycles and efficiency. The Otto engine operates on an idealized cycle that is not reversible, while the Carnot engine represents a theoretical model that achieves maximum efficiency due to its reversible nature. The Carnot engine's efficiency is defined by the temperatures of the heat reservoirs, making it superior in terms of thermodynamic performance. Additionally, the PV diagrams for both engines illustrate distinct shapes, reflecting their operational differences.
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