What is short-circuiting?

How is a circuit overloaded?

$(i)$ Write the values of the following physical quantities in connection with domestic power supply in our country: $(a)$ potential difference between live wire and neutral wire.
$(b)$ frequency of $AC$.
$(ii)$ Explain the role of the following as safety measure in domestic electric appliances/circuits:
$(a)$ earth wire
$(b)$ fuse.

What is short-circuiting in an electric supply?

Mention the voltage and frequency of the electric current that we receive in our houses.

Name two safety measures commonly used in electric circuits and appliances.