The most appropriate value of fuse for a kettle rated 220 V, 1.06 kW is

Analyze the question: We need a fuse rating for a kettle rated 220 V and 1.06 kW. The fuse must be slightly higher than the normal operating current, so the kettle works normally but the fuse blows if the current becomes too large.

Concept: Power P = IV, so the working current is I = P / V.

Solution:

1. Convert the power to watts: 1.06 kW = 1060 W
2. Calculate the current: I = 1060 / 220 ≈ 4.82 A
3. Choose a fuse rating just above 4.82 A.

Checking the options:

• A (3 A) is below the working current, so it would blow immediately.
• D (4 A) is also below 4.82 A, so it would blow.
• C (5 A) is just above 4.82 A, so it is suitable.
• B (6 A) is safe, but it is not the closest rating above the working current, so it is less appropriate.

The most appropriate fuse is therefore 5 A, which is option C.

Exam tip: For fuse questions, always calculate I = P/V first, then pick the smallest fuse rating that is greater than that current. Never choose a fuse below the working current, and avoid ones far above it, because they give poor protection.