How far can electricity travel in water?

Answer 1

Voltage does not run through power lines. If it did, then birds would be killed instantly

as soon as they sat on a power line.

Voltage is the difference in potential between two things. In the case of power

lines, it may be between the two wires in an extension cord, or between one wire

and the Earth. The bird is fine, because both of his feet are on the same wire, and

there's no difference in potential between them.

The utility lines that enter your house measure 110 volts, 220 volts, or 480 volts

compared to the Earth. When you plug a lamp, a cellphone charger, or a radio into

an ordinary outlet in your house, there is typically 110 volts between the two prongs

of the plug.

The primary line that runs down the street along the very top of the poles measures

2400 volts, 4800 volts, or 7200 volts compared to the Earth.

The heavy cables that carry power from the generating stations to the distribution

substations, or intercity along the large transmission towers, measure several tens

of thousands of volts compared to the Earth.

Answer 2

They can travel 1000 meters before needing a reapeter