Define electric fuse. How is it acted as a safety device in an electric circuit ?

What is an electric circuit ?

A switch is an on-off device in an electric circuit.

Fuse is connected in an electric circuit.

What does an electric circuit mean ?

State a relationship between electrical power, resistance and potential. difference in an electrical circuit.

What is the function of a key (or switch) in an electric circuit ?

Define electric current. What is its SI unit?

Define negative electric flux.

What is the purpose of using a fuse in an electrical circuit?

Write the function of voltmeter in an electric circuit.