Electrical Studies for Trades 5th Edition by Stephen L. Herman pdf book

Electricity is the driving force that provides most of the power for

the industrialized world. It is used to light homes, cook meals, heat

and cool buildings, drive motors, and supply the ignition for most

automobiles. The technician who understands electricity can seek

employment in almost any part of the world.

Electrical sources are divided into two basic types, direct current

(DC) and alternating current (AC). Direct current is unidirectional,

which means that it flows in only one direction. The first part of this

text will be devoted mainly to the study of direct current. Alternating

current is bidirectional, which means that it reverses its direction of

flow at regular intervals. The latter part of this text is devoted mainly

to the study of alternating current.