An electrical kettle is rated 3 kW, 250 V. Give reason whether this kettle can be used in a circuit which contains a fuse of current rating 13 A.

Solution:

expression for the safe limit of current for the kettle is

I = P/V

Upon substituting values, we get

I = 3000 / 250 = 12 A

Yes, this kettle can be used in a circuit that contains a fuse of current rating 13 A. Since the safe limit of current for kettle is 12 A.