Lesson: Heat EnginesPhysics
In this lesson, we will learn how to calculate the work extracted by heat engines from the transfer of heat from high to low temperature reservoirs.
Sample Question Videos
A Carnot engine has an efficiency of 0.500. The temperature of the engine’s cold reservoir changes and its efficiency drops to 0.450. The initial temperature of the cold reservoir is . The temperature of the hot reservoir does not change.
What is the temperature of the hot reservoir?
What is the temperature of the cold reservoir after its temperature changes?
It is found that an engine rejects 100 J while absorbing 125 J each cycle of operation.
What is the efficiency of the engine?
How much work does it perform per cycle?
An engine operating between heat reservoirs at temperatures of and extracts 1,000 J per cycle from the engine’s hot reservoir. In modeling the heat flow in the engine, use three-significant-figure precision.
What is the maximum possible work that engine can do per cycle?
What is the minimum heating of the cold reservoir per cycle?