I had a question, can you answer it: as you can see in the picture I uploaded, the single-phase alternating current flows in one wire at one moment and in the next moment from another wire as in the picture, but why when you connect the phase meter(voltage tester or neon screwdriver ) to the phase wire When we hit it, it light on, but it doesn't light on in the neutral wire? I think the AC current flows only in one wire as the second photo or does the three-phase current become it after the transformer? One picture:
In the first picture, it shows the ac current. At the first moment, the direction of the electrons from the wire is forward and at the next moment, it is backward. The phase wire makes a circuit by connecting to the neutral wire. Now, according to the first figure, the ac current flows once from phase to neutral and once from neutral to phase? In this case, the voltage tester light should be lit on both the phase and neutral wires!