Transmission lines are commonly energized at:

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Multiple Choice

Transmission lines are commonly energized at:

Power is transmitted most efficiently when voltage is raised and current is kept low. Since P = VI, for the same amount of power, increasing voltage reduces current, which lowers conductor losses (I^2R) and minimizes voltage drop along the line. This is why bulk power transmission uses very high voltages. Lower voltage levels are used for distribution closer to customers, where insulation, safety, and equipment costs are more manageable. So the range that corresponds to transmission lines, not distribution or subtransmission, is the high-voltage end of the spectrum.

Power is transmitted most efficiently when voltage is raised and current is kept low. Since P = VI, for the same amount of power, increasing voltage reduces current, which lowers conductor losses (I^2R) and minimizes voltage drop along the line. This is why bulk power transmission uses very high voltages. Lower voltage levels are used for distribution closer to customers, where insulation, safety, and equipment costs are more manageable. So the range that corresponds to transmission lines, not distribution or subtransmission, is the high-voltage end of the spectrum.

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