Question 12 - MCQs from (Past Year Papers & NCERT Exemplar) - Chapter 12 Class 10 - Electricity

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:

The rating of fuse wire must be slightly greater than the current flowing through the device.

Given,

• Power, P = 1 kW = 1000 W
• Voltage , V = 220 V

We know that,

Current, I = P / V

Therefore,

I = 1000 / 220 = 4.5 A

So, rating fuse wire = 5 A 

So, the correct answer is (d).