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: Option 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.