In a.c. supply we say that every half cycle the vtg supply changes polarity. Then why we say that there is a live wire and the other is the neutral that provides the return path

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In a.c. supply we say that every half cycle the vtg supply changes polarity. Then why we say that there is a live wire and the other is the neutral that provides the return path

Physics
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For current to flow there must be a potential difference. The live wire carries the charge generated in the device while the charge carried by neutral wire is zero, which creates the potential difference for the current to flow.

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