Why is power transmitted at high voltage?

Question

Answer 1

Why is power transmitted at high voltage?

To reduce the current and hence the losses due to heat. ✓
To increase the current and hence the power transmitted.
To reduce the voltage and hence the losses due to heat.
To increase the voltage and hence the power transmitted.

Explanation

Power = voltage × current. For the same power, a higher voltage means a smaller current.

Heat lost in the cables is I²R, so a small current reduces the current and hence the losses due to heat. This is why NEPA lines use very high voltages.

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