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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?

A.

2A

B.

5A

C.

10A

D.

20A

Correct answer is D

The maximum current drawn by the cooker is given by;
I = \(\frac{P}{V}\)
∴ I = \(\frac{\text{3000}}{200}\)
I = 15A
The fuse rating = I \(\times\) 125% (the fuse is rated at 125% of the normal operating current)

Hence, the fuse rating = 15A \(\times\) (\(\frac{125}{100}\)) = 18.75amps

Therefore, the best fuse is 20A.