Second Law-cont.
- A process can not happen unless it satisfies both the first and second laws of thermodynamics. The first law characterizes the balance of energy which defines the “quantity” of energy. The second law defines the direction which the process can take place and its “quality”.
- Define a “Heat Engine”: A device that converts heat energy into work while operating in a cycle. Ex: A steam power plant.
DQ-Wnet=DU, DU=0 for a cycle
Question: Can we produce an 100% heat engine? QL=0?