Question

Fuse of 3A, 5A and 10A are available. Calculate and select the fuse for operating electric iron of 1kw power at 220 V line.

Answer 1

1kw=1000w0
w=v×i
1000=220i
1000/220=i
4.54=i

SO ,5A FUSE CAN BE USED FOR OPERATING
AN IRON.........

Answer 2

Here,

the formula for solving the same is I=P/E

Where, I = Current, P = Power and E = Electromotive force in volts

Here, it is given that

P =1KW =1000 W.

V =220

So, I = 1000/220

=4.54A

Therefore, from the math, we get that the fuse wire should be 5A