Review of the First Law

In this lesson, we will discuss the limitations of the 1st Law why we need the

Second Law of Thermodynamics

.
The 2nd Law is the key to the analysis of thermodynamic cycles.
Energy can be neither created nor destroyed;
it can only change forms.

The First Law of Thermodynamics

A large amount of heat is rejected.
A relatively small amount of heat is absorbed by the system from the cold reservoir.
A relatively small amount of work is input to the system.
This diagram shows the relationship between a cycle diagram and the series of process steps that make p a cycle.
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Ch 6, Lesson A, Page 1 - Review of the First Law