Answer Posted / pavan

The Area of cross-section of a current carrying conductor,
depends upon the amount of current it has to carry.

1 sqmm of aluminium conductor has a capacity of carrying 1
Ampere of current and can be loaded upto 1.5A

1sqmm of Copper conductor has a capacity of carrying 1.2
Ampere of current and can be loaded upto 2.5A

So when Heavy loads are to be transmitted at long distances
we use high voltage so that the current becomes less, there
by decreasing the conductor size, losses etc.

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