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# Why is voltage so high in power lines?

Question #112449. Asked by rfcneil. (Jan 28 10 12:48 PM)

looney_tunes

"Electricity is transmitted at high voltages (110 kV or above) to reduce the energy lost in long distance transmission. ... Transmission efficiency is improved by increasing the voltage using a step-up transformer, which reduces the current in the conductors, while keeping the power transmitted nearly equal to the power input. The reduced current flowing through the line reduces the losses in the conductor. According to Joule's Law, energy losses are directly proportional to the square of the current. Thus, reducing the current (amperage) by a factor of 2 will lower the energy lost to conductor resistance by a factor of 4."

http://en.wikipedia.org/wiki/Electric_power_transmission

 Jan 28 10, 1:15 PM

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