Power Lines Relating to Physics
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Power Lines Relating to Physics

[From: ] [author: ] [Date: 12-04-03] [Hit: ]
voltage, current and power.-For a given wire sizeand transmitted power, resistance losses scale as the inverse SQUARE of voltage.The power lost is I*V,Since I = P/V,......
Why is it that power lines run at high voltages outside the city? Please explain using resistance, voltage, current and power.

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For a given wire size and transmitted power, resistance losses scale as the inverse SQUARE of voltage.

P = I*V
I = P/V

The resistive voltage drop in a wire of resistance R is I*R
The power lost is I*V, so the power lost is I²R
Since I = P/V, power lost is P²R/V²

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Call your electric company
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