Why do we use 220 V electric power?
Answer:
all our devices are made to work at this voltage.its just a standard that is set...u may use tranformers if u want any voltage other than this value.....
it's as much as the system in our houses can take...
This is a very good question.
It needs a book to answer.
There are a number of answers and here is one of them.
The original voltage for houses was DC but this could not be sent (transmitted) for long distances.
Thus it was replaced with AC (alternating current). This really means the supply was replaced with alternating (oscillating) voltage at a rate of either 50 cycles or 60 cycles per second.
One of the first countries to use AC had a voltage of 110v. But when you use a low voltage like this, any drop in voltage is very noticeable (the lights dim). A much better choice was to use 220v so that any small drop in voltage did not upset the lights.
We could use a higher voltage but the risk of sparks and leakage and insulation problems become more troublesome.
With a 220v (to 240v) supply we can draw 2,200 watts from each circuit and this involves a current flow of 10 amps.
Plugs and sockets and switches can handle 10 amps without any problems such as "welding" or heating. When the current rises to 20 amps (as with 110v installations) the problem of switching this current is enormous. In addition, the wiring has to be thicker and plugs and sockets have to be more robust.
220v is the middle-of-the-road solution.
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