Question

an electric current of 1kw is operated at 220volt find whichof the following fuses that respectively rated at 1ampere,3 ampere and 5 ampere

Answer 1

p= vi

1000=220*I

1000/220=I

I = 4.54 ampere

so the fuse of 5 ampere is absolutely right for the appliance

hope it helps !!