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?
1A
2A
4A
5A
A
2A
B
5A
C
1A
D
4A
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Solution
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Hint : A fuse wire should be able pass that amount of current which the appliance requires
Step 1 : Find the maximum current that the appliance requires
Given, Power =1KW=1000W & Voltage =220V
P=V×I
So, I=PV
I=1000220=4.545A
The fuse wire should be able to pass at least 4.545A current.
So, the rating should be 5A.
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