Question

An electric kettle consumes 1kw of electric power when operated at 220v. a fuse wire of what rating must be used for it

Answer 1

Used for it? 
1A 
2A 
4A 
5A
-
P = V*I => 1kW = 1000W = 220*i => 1000W/220V = i = 100/22 = 50/11 = 4.55A so the answer is 5A
-
6A 

Current consumed is 1000/220 = 4.54A. 133% of that is 6.06 

RERATING: For 25ºC ambient temperatures, it is 
recommended that fuses be operated at no more than 
75% of the nominal current rating

Answer 2

Answer:

given:-p = 1 K W which is=1000W

V=220V

Now P=VI

therefore I = P/V

I=1000/220= 4.5A

therefore the rating must be either 4.5A or 5A.

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