Question

An electric kettel consumes 1KW of electric power when operated at 220 V. A fusewire of what rating must be used for it?

Answer 1

By P=W/T
=P=VQ/T
=P= VI
SO NOW PUT THE GIVEN VALUES AND GAT THE ANSWER
1000=220.A
$1000 \div 220 = 4.5 \\ = \\ a = 4.5a$