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

Answer: (d) 5 A

Given parameters

  • Power (P) = 1 KW = 1000 W
  • Voltage (V) = 220 V

The maximum current that the appliance requires can be calculated as

P = V × I

I = P/V

I = 1000/220

I = 4.545 A ≈ 5A

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