Each hot terminal of the transformer measure 120V to the neutral, or common.
Each hot measured to the other is 240V.
On the main service for residential, the neutral is usually tied to ground, so they are the same points, electrically, but serve different purposes. The ground will normally not have any current on it unless something is wrong.
I don't like to think of the neutral as a return since it is AC and current actually flows both ways.
The neutral is just as dangerous on energized circuits because it is a current path, so don't be fooled by the color coding or grounding.
Neutral wire is simply used to Close the circuit for a single phase circuit. For 3 phase circuit, it is used as a safety wire connected to the transformer and to the ground, in case of any short circuit in the transmission line, the current flows through the neutral wire and by saving severe damage to the transformer and other lines.
Do you mean in house wiring?
neutral is the return line. Current flows form the hot wire through the load and back via the neutral wire. Current always flows in a loop.
Neutral line is one wire comes out from the step down transformer secondary winding coil where to produce 230V in your country India. Any electrical power source requires at least two wires to deliver its power to any load ( electric load like a lamp ).
neutral wire make the circuit closed ie it helps the current to return to the source this make a current flow and create potential across load.
neutral wire comes from neutralize i.e to pass out the current after its used.
To fully understand that you must first understand the mechanics of multi-phase
alternating current power systems. -(Too much to give you fully here, Wiki it.)
Basically, the system uses both phase to phase, and phase to ground current
paths to provide power to equipment.
The neutral is the 'return' path for Phase to ground currents required by
the distribution system.
