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The objectives of this chapter are to introduce the concept of energy, the various types
of energy, and what is meant by the term power. We will explain various mechanical
forms of energy including kinetic energy, potential energy, and elastic energy. We will
also revisit the definition of thermal energy forms from Chapter 11, including heat
and internal energy. Next, we will present conservation of energy and its applications.
We will define power as the rate of doing work and explain in detail the difference
between work, energy and power. After our discussion, these differences should be
clear to you. The common units of power, watts and horsepower, are also explained.
Once you have a good grasp of the concepts of work, energy, and power, then you can
better understand the manufacturer’s power ratings of engines and motors. Moreover,
in this chapter we will also explain what is meant by the term efficiency and look at
the efficiencies of power plants, internal combustion engines (car engines), electric
motors, pumps, and heating, air-conditioning, and refrigeration systems.
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