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 = \(\frac{P}{V}\)
∴ 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.
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