When connected to a mains of 250V, the fuse rating in the plug of an…

Physics JAMB 2002

When connected to a mains of 250V, the fuse rating in the plug of an electric device of 1 KW is

  • 2 A
  • 3 A
  • 4 A checkmark
  • 5 A

The correct answer is: C

Explanation

1 KW = 1000 watts, power P = IV, thus for a mains of 250 V, the maximum permissible Current I = 1/V = 1000/250 = 4 A
Thus the fuse rating in the plug should be 4 A
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