An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?

(a) 1 A

(b) 2 A

(c) 4 A

(d) 5 A



The rating of fuse wire must be slightly greater than the current flowing through the device.


  • Power, P = 1 kW = 1000 W
  • Voltage , V = 220 V

We know that,

Current, I = P / V


I = 1000 / 220 = 4.5 A

So, rating fuse wire = 5 A 

So, the correct answer is (d).

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo