Question

Which of the following fuse ratings would be suitable for the electric iron of 1kW operating at 220V?
$1A,3A,5A,13A$

Answer 1

For the electric iron of $1kW$ operating at $220V$, the current is given as,

$I=\frac{P}{V}$

$=\frac{1000}{220}=4.54A$

Thus, the suitable fuse is $5A$ because it is slightly more than the current flowing through the circuit.