Question

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. 1A
• B. 2A
• C. 4A
• D. 5A

Answer 1

Answer: (D)

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 $=220V$

$P=V\times I$

So, $I=\frac{P}{V}$

$I=\frac{1000}{220}=4.545A$

The fuse wire should be able to pass at least $4.545A$ current.

So, the rating should be $5A$.