The electric power is generated at 11,000V at a power station. It is then transformed to 1,32,000V using a step up transformer.
For a given electric power, when voltage increases, the electric current decreases as P=VI or I=P/V.
Hence , at high voltage low current is involved.
As current decreases, the power loss(I in the transmission lines decreases in the form of heat .
To reduce this loss, high voltage is preferred
Why is echo not heard in our living rooms? To hear echo, the minimum distance between the source and the reflector must be 17m. When this distance is more than 17m, the reflected sound can be distinguished from the original. As the length of our rooms is less than 17m, we don't hear echo.
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