Alternating Current does not flow through a conductor in the same
direction as what dc does. Instead, it flows back and forth in the
conductor at the regular interval, continually reversing its direction
of flow and can do so very quickly. It is measured in amperes, just as
dc is measured too. Remember, one couloumb of electrons is passing a
given point in a conductor in one second. This definition also applies
when ac is flowing- only now some of the electrons during that 1 second
flow past the given point going in one direction, and the rest flow past
it going in the opposite directions.
|Difference between DC and AC|
The industrial applications of alternating current are widespread. These
include the many types of induction motor, ranging in size employed in
wind tunnels and reclamation projects, transformer equipment used in
connection with welders and many kinds of control devices, communication
systems, and many others.
The advantages of ac generation are, however, apparent when it is
recognized that it can be accomplished economically in large power
plants where fuel and water are abundant. But nowadays, solar power is
becoming popular as power plants through solar panels. Moreover,
generators and associated equipment may be large, an important matter in
so far as cost per kilowatt is concerned; also transmission over
networks of high-voltage lines to distant load centers is entirely
In Part 2 of Learn Electrical Engineering for Beginners, you will study
the nature, behavior and uses of time-varying or alternating current.
You will study the for the first time two components – the inductor and
the capacitor which are frequently used to control direct as well as
alternating current and voltage. The resistors, in which we all know
acted in such a way as to restrict the flow of current directly. In
other words, the bigger the resistor you put in, the more you restrict
the current flow. The inductor and the capacitor, on the other hand, act
to control the current and voltage in different ways, and you will see
that they do depends on how often the current is reversed. These three
components – the resistor, inductor and the capacitor are basic elements
of electric and electronic circuits.
|Resistor, Capacitor and Inductor Behavior in AC Circuits|
As of now, you will not understand the meaning of the behavior of the
given diagram shown above. But as we started the first topic of AC
Circuits on my next post, you will appreciate and understand gradually
what really mean by AC Circuits.