As you can see in the
photograph, the electrical system has a lot of elements. The first of them is
the electric generation. The generators use the wind power, fuel, coal and
natural gas, among others, to produce electricity in the alternator.
In a conductor, if
current increase, the conductor get warm, and lose power. This is known as
Joule heating. For this reason, in electrical substations, current level
decrease, and voltage level increase, keeping the same level of power.
So, long lines you see
at periphery are called high voltage
lines. These lines arrive to other electrical substations, and they adapts
current and voltage level for domestic using.
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