Why Power Lines Have Exactly 3 Wires: The 120° Rule

追加: 2026-05-19

[00:00:00]Every power line above you has three wires, but electricity only needs two.

[00:00:04]Unless you want the power to never stop flowing.

[00:00:07]Three wires, three currents, each offset by exactly 120°.

[00:00:12]Two wires pulse to zero. Three wires never do.

[00:00:16]The third wire isn't backup. It keeps the grid from pulsing 120 times per second.

[00:00:21]Your lights stay constant because those three wires never rest.