How does single-phase and three-phase current work exactly, and whats the difference?

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Hey everyone,

I’m getting into electric speciality and, to be honest, never understood (made it clear in my head) how does AC or DC work, why there are three/single phases used?

by „Make clear in my head” I mean I generally have some knowledge, but couldn’t be able to explain it to somebody else. Thanks!

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5 Answers

Anonymous 0 Comments

When you see a sine wave, you should think in terms of a rotating circle. With single phase power you have one connection to the rim of the circle, with three phase power, you have three connections to the rim of the circle 120 degrees apart.

To help visualize it:

Single phase power is like a simple crank: http://507movements.com/mm_092.html

Three phase power is like a Schmidt coupling: https://www.youtube.com/watch?v=ARs3y3i0enE

DC would be something like a bicycle chain.

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