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
`I = (P)/(V) = (1 kW)/(220 V) = (1000 W)/(220 V) = 4.5 A`. Thus, rating of fuse-wire is `5 A` (which is greater than `4.5 A`).