Question

A fuse is rated $8$A. Can it be used with an electrical appliance rated $5$KW, $200$V? Give a reason.

Answer 1

Rating of the electrical appliance is given as : $P=5000W$ and $V=200$ Volts
Maximum current that can flow through the appliance $I=\frac{P}{V}=\frac{5000}{200}=25A$
Since the safe current value of the fuse is $8A$ only which is less than $25A$. So it cannot be used with the given electrical appliance.