alleryA fuse for a 10 A appliance should be rated approximately:
AExactly 0 A
BSlightly below 10 A
CSlightly above 10 A
DEqual to the supply voltage
Answer & Solution
Correct answer: C. Slightly above 10 A
1. A fuse melts when the current through it exceeds its rated value.
2. It must therefore be set slightly higher than the appliance's normal operating current.
3. A 10 A appliance needs a fuse rated slightly above 10 A (such as 13 A).
4. A lower rating would melt during normal use and cut off the supply.
5. A zero rating cannot carry any current at all.
6. So the right choice is a fuse rated slightly above 10 A.
_Source: syllabus Science Ch 13 'Magnetic Effects of Electric Current' (learncbse.in extract)_
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