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Question 31650
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Current Electricity: Fuse Wire MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Fuse WireEasyQuestion 31650

Question

A fuse wire melts when current exceeds its rated value because:
  1. A
    It has very high resistance always
  2. B
    Joule heating exceeds the melting point of the wire
    Correct
  3. C
    It has zero resistance
  4. D
    Voltage exceeds limit

Correct answer

Joule heating exceeds the melting point of the wire

Explanation

H = I²Rt; excess current raises temperature until the wire melts, opening the circuit and protecting the rest of the system.

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