Question

How many wires are present in domestic circuit? Explain their function

Answer 1

Live wire is exactly what its name implies. it carries current from the power company into your home or business. The main wire feeding your subpanel is live and carries around 120 V AC or 240 V depending on where you live. In a home or office, these current carrying wires provide power to loads. These wires are usually represented with a black or red wire in domestic situations.
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Answer 2

3 wires:

Positive (live wire)

Negative (black color)

Earthing (Green Color) : It is used to carry any accidentally leaked current from the metal body of the equipment to the metal plate burried deep inside the ground.

Positive and Negative ends maintain potential difference , which is the only reason why electricity flows.