We need to step-up the voltage for power transmission, so that
(i) the current is reduced and consequently, the `"l"^{2}`R loss is cut down
(ii) the voltage is increased , the power losses are also increased
(iii) the power is increased before transmission is done
(iv) the voltage is decreased so `"V"^{2}`/R losses are reduced
(i) the current is reduced and consequently, the `"l"^{2}`R loss is cut down
Explanation:
i.e. current is reduced if voltage is stepped – up so corresponding `"I"^{2}`R losses are cut down.
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