As it is well known fact that in a DC system, two terminal exist

(positive and negative) and current or power flows from positive to

negative. so it can be say that one conductor carries current and

other returns the same current and there must be close loop to current

flow.

I m wondering what happens to three phase AC system. In a 3 - phase

AC system, all three conductor carries current/ voltage/power with 120

deg apart assuming system is balanced. my question is how current is

returned to the source. let's say source generates power and power

flow from source to load but how about return power from load to

source?

- posted
14 years ago