1.AC suffers from significantly less line loss than DC when transmitted over long distances because it is easy to step it up to extremely high voltages.
2.Large electrical generators happen to generate AC naturally, so conversion to DC would involve an extra step.
3.Transformers must have alternating current to operate, and the power distribution grid depends on transformers.
4.It is easy to convert AC to DC but expensive to convert DC to AC, so if you were going to pick one or the other AC would be the better choice of the two. The power plant therefore produces AC. However, it produces three different phases of power simultaneously, and the 3 phases are offset 120 degrees from each other. Out of every power plant comes 4 wires: the 3 phases plus a neutral or ground common to all 3.
ALTERNATING CURRENT
A flow
of electrical current which increases to a maximum in one direction, decreases
to zero,
and then reverses direction and reaches maximum in the other direction
and back to zero. The cycle is repeated continuously. The number of such
cycles per second is equal to the frequency
and is measured in ‘’Hertz’’. U.S. commercial power is 60 Hertz (i.e. 60
cycles per second).

These
structures are in essence made up by two identical interconnected graphs
representing one of the basic elements of Western ideography, .
Ideographically,
is a sign for one complete oscillationor
one
whole wave. If we take the straight line as our graphic reference,
then the complete wave of a guitar string when strummed, will move back
and forth above and below the straight line, graphically
(the sign for frequency). Consequently,
represents all types of waves
in Western ideography.
In musical notation
stands for grupetto, i.e. that one should play a group of four
notes, the note above, the note itself, the note below, and the
note itself.
In eighteenthcentury chemistry meant solvere, to dissolve, and solutio, or solution. In propositional logic, P means that the opposite of P is true. In electrical contexts stands for alternating current. In dictionaries stands for words that have been referred to earlier or indicates that a term or expression is interchangeable with another. In mathematics can stand for varies as, is similar to, or is a complement of. In Spanish and Portuguese writing used over certain letters indicates a certain pronunciation and is called tilde. In meteorology has been, or is used to indicate ice or a coating of ice. The latter is also drawn and . In genealogical contexts and can mean baptized.

14:5
· When
is doubled it stands in mathematics for approximately the same as.
In the context of electricity
can mean alternating current, or, in specific situations, alternating
current that is within the audible frequency range.

This
ideogram is used in some mathematical, geometrical and other sign systems
with the meaning isomorph
with or congruent with, i.e. of the same form as. It
can also mean approximately equal to. Taking the equals sign, ,
as a starting point, the upper line has been replaced by the sign for a
complete oscillation,.
This implies an equality in one dimension
and a variance in the dimension of quantity.
Compare with for frequency. In electrical contexts signifies alternating current, which also can be drawn , , and . The sign often appears in unexpected places, for example in , one of the many Jesus monograms of the type beginning to be used in the seventh century. In Latin the monogram IHS can be interpreted as I(n) H(oc) S(igno) vinces, that is, In This Sign You Will Be Victorious, or I(esus) H(ominem) S(alvator), that is Jesus, Saviour of Men. As is the sign representing a complete oscillation, it might be that in refers to Christ's defeat and victory, death and resurrection.

This
ideogram is often used to represent alternating current and sometimes
frequency.
With the former meaning
is synonymous with ,
and ,
whereas frequency can also be drawn as .
Note that
is the sign for one whole wave or oscillation.

it aggravates and it pacifies
hear the power in the lines
strung high on every pole
how can this power be bought
and sold?
trying to harness solar
rays
making minutes seem like
days
it captivates and it hypnotizes
hear the power in the lines
powerline