A 3000W electric cooker is to be used on a 200V mains cir...
A 3000W electric cooker is to be used on a 200V mains circuit. Which of the fuses below can be used safely with the cooker?
2A
5A
10A
20A
Correct answer is D
The maximum current drawn by the cooker is given by;
I = PV
∴ I = 3000200
I = 15A
The fuse rating = I × 125% (the fuse is rated at 125% of the normal operating current)
Hence, the fuse rating = 15A × (125100) = 18.75amps
Therefore, the best fuse is 20A.