Fuse
A fuse is a safety device connected in a circuit to protect it from excessive current.
Practice This ConceptMain explanation
Teacher explanation
A fuse wire has a low melting point and is connected in series, usually in the live wire. If the current becomes too large, the fuse wire gets heated and melts, breaking the circuit. This protects appliances and wiring from damage.
Example
If an overload occurs in an iron circuit, the fuse melts and stops the current before the wires overheat.
Simple analogy
Fuse saves the circuit by melting first.
Common confusion
Students sometimes place the fuse in parallel or think it allows extra current to pass safely.
Exam tip
Always mention series connection, live wire, and melting due to excess current in answers.
Answer writing and exam use
1-mark use
Write the exact meaning of fuse in one clean line.
2-mark use
Define fuse and add one example or condition.
3-mark use
Explain fuse, show the method or example, and mention the common mistake.
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