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
The correct answer is: D
Explanation
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.