I had learnt from a book in a lower class that electric power distribution from the generating station is done in phases. Like in India, we have three phases of power transmission: the red, green and yellow colours distinguish the three phases. I believe the same is the case in any other country, irrespective of their voltage supply or frequency of AC. Wikipedia has an article on this. I learnt from this article that the live is brought from the generating station via three different cables, and no neutral wire is there. The AC in the three wires are of the same frequency and voltage, but differ in phase by one-third a time period. I've also understood the necessity of differentiating into phases so that more power can be supplied. But can you explain why is there a phase difference? What difference does it make if I removed the phase difference completely? Moreover, there is no neutral wire. I have recently learnt from a previous question of mine in this forum, the difference between the live and the neutral wires from and local transformer. I understood that in the neutral us and ways at 0V as it is earthed somewhere. When the voltage of the live wire changes to a negative half cycle, then the current flows through the neutral wire as 0>-ve. But we never get a shock because we ourselves being earthed, we and the neutral are at same potential. Now the question arises as to how the return path of the current is completed in the absence of a neutral wire during power dustribution. Is it that one output of the dynamo is connected to the ground, and one wire of the city substation is also earthed, so that there is a transfer of electrons through the earth?