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
Which is always constant for a machine of given design: MA or VR ? Ans: VR remains constant for a machine of given design as it depends on the distances moved by the load and effort but MA can vary due to the friction developed between the moving parts of the machine.
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