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Why high voltage is used in power transmission?

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Answer :

In order to increase efficiency  And decreases the absorption during transmission through cables.
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Answer :

The primary reason that power is transmitted at high voltages is to increase efficiency. ... The lower current that accompanies high voltage transmissionreduces resistance in the conductors aselectricity flows along the cables. This means that thin, light-weight wires can beused in long-distance transmission.

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