2007-10-09 05:07:54 · 2 answers · asked by sachin m 1 in Science & Mathematics ➔ Engineering
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2007-10-09 05:41:37 · answer #1 · answered by tinfoil666 3 · 1⤊ 0⤋
Power losses in transmission lines are mostly due to I^2*R losses in the wire. Since you can't do much about R (making cables larger diameter for lower resistance is too expensive), the only thing left to do is lower the current, I. Besides, the losses are proportional to the square of the current -- for example reducing the current by 1/2 decreases the power loss by a factor of 4.
For a given amount of power transmitted in a line, the only way to decrease the current is to increase the voltage. The only type of voltage that is easily increased through the use of a transformer, is AC (not DC).
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2007-10-09 06:30:18 · answer #2 · answered by tlbs101 7 · 1⤊ 0⤋