/diy/ - Do It Yourself

I understand that in a three phase system with star connections there is no current going through point A to point B (if the loads are balanced) and that the neutral has no voltage in relation to ground.

But what happens in points 1, 2 or 3? There has to be current flowing between R1-R2, R1-R3 or R2-R3 depending on the AC wave, right?