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UNIT IV

Electrical Power Conversion Systems

One of the most important aspects of electrical power systems is the
conversion of electrical power into some other form of energy. Electrical
power is ordinarily converted into light, heat, or mechanical power. The
power is converted using either resistive, inductive, or capacitive circuits.
The fundamental characteristics of electrical power conversion systems
are discussed in Chapter 11.
The basic types of electrical power conversion systems are stud-
ied further in the remaining chapters. Heating systems are discussed in
Chapter 12. Those systems that convert electrical energy into heat ener-
gy use three methods, incorporating resistive, inductive, and capacitive
circuits. Basic welding method systems are also included in this chapter,
since they are a unique type of electrical load. Chapter 13 deals with the
conversion of electrical energy into light energy. Lighting systems include
incandescent, fluorescent, and vapor lighting systems. The systems that
convert electrical energy into mechanical energy are discussed in Chapter

15. The major mechanical energy conversion takes place in electric motors.
    Both direct current (DC) and alternating current (AC) motors are studied
    in that chapter.
    Figure IV shows the electrical power systems model used in this book,
    and the major topics of Unit IV—Electrical Power Conversion Systems.

Fundamentals of Electrical Loads (Chapter 11)
Heating Systems (Chapter 12)
Lighting Systems (Chapter 13)
Mechanical Systems (Chapter 14)

Figure IV. Electrical power systems model