A source of potential difference V volt sends current I ampere in a circuit for time t second. Write expressions for

(a) electrical energy supplied by the source, and

(b) electrical power spent by the source.

Name the unit in which you pay the cost of your electricity bill. How is it related to joule?

What is an electric fuse? State its purpose in the household electrical circuit?

State one property of the material of a fuse wire.