How to Distinguish the Variable DC
Sometimes two kinds of electric current:
constant and variable. But only widely used alternating current. This is due to
the fact that it can be transformed (transforming) with minimum energy loss.
To begin with we shall understand that what
the electric current is. Directional movement (flow) of charged particles is
called an electric current. In an alternating electric current through a
conductor cross-section for equivalent periods of time pass different amounts
of charged particles. The number of particles is constant for the same data
always equivalent intervals. AC constantly changes its strength, the magnitude
or direction. And these changes occur always periodically, that is repeated at
regular intervals. For example, using an alternating current cannot charge the
battery or you cannot use it for such technical purposes.
Unlike DC current , AC has a few additional
values: - period - the time value of the commission of the complete cycle of
alternating indices of current ; half-cycle and frequency (number of cycles for
a given period of time), - the amplitude - the highest value of the alternating
current , - the instantaneous value - the value of current at a given time.
AC is more common and widely used. It is
easier to convert into an alternating current of another voltage, the voltage
change in electrical networks, depending on the need. This can be done by a
transformer. Transformer - the device that converts alternating current of one
voltage in the same current, but another voltage at the same frequency current.
In addition, the use of alternating current
reduced to the fact that electric motors that operate on alternating current is
much more reliable and more efficient than DC motors current. They do not
require frequent maintenance, which makes them an inexpensive operation. And
also, very importantly, they have a higher degree of protection. BTW, you can select
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