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. `1 A`
B. `2 A`
C. `4 A`
D. `5 A`

Answer 1

Correct Answer - D
Given, power, P = 1 kW = 1000 W

Voltage, `V = 220 V`
Current, I = ?
`I = (P)/(V) = (1000)/(220) = 4.5A`
Thus, the rating of fuse-wire is 5 A which is greater than 4.5 A.