What's the use of the live wire,neautral wire and earth wire in a plug? The purpose
1. When it's working normally, Voltage would be present across Live and Neutral wire. Current would flow from Live to Neutral Wire. 2. When there is a fault, The voltage will be present in the live wire and as the circuit is not closed, No current would be flowing. 3. No it's not correct. But in some cases, the earth wire would be transmitted to the sub station where in its joined with the neutral. 4. Green 5. The Casing would be connected to earth. Hence the neutral is shorted with earth.
Other guy is correct for the U.S., but from your wording, I think you live in the U.K. The live (hot) and neutral wires convey the power to the device or appliance, with the hot have a potential of 220-240 volts AC, with respect to the neutral, like the + and - terminals of a battery. The ground/earth connection is for safety, and no current flows in it under normal use. It is connected to any metal parts of an appliance. The neutral is connected to ground in the breaker box or somewhere in your basement or nearby. If there is a short in an appliance and a high voltage gets connected to a metal part, this could be a lethal hazard. But since the metal parts are connected to safety ground, it instead causes a circuit breaker to pop, disconnecting the voltage. .
