Thermal Efficiency https://www.miniphysics.com/uy1-heat-engines-thermal-efficiency.html η = Wout/ QH Thermal Efficiency is what you get over what you had to pay a perfect heat engine has a thermal efficiency of η = 1. There is no such thing as a perfect heat engine! Also written as: η = 1 - Qc/QH Thermal Efficiency is the perfect heat engine minus the energy that wasn't used over what you pay. or thermal Efficience is the perfect heat engine minus the cold reservoir over the hot reservoir

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