Single correct option
A fuse wire used in electrical circuits should be made of a material having
- A. low melting point
- B. high melting point
- C. very high resistivity and high melting point
- D. low resistance and high melting point
Show answer and solution
Answer: (A) low melting point
A fuse protects a circuit by melting when excess current flows and the heat produced (I²R) rises. So the wire must have a low melting point; a tin-lead alloy is used. A high melting point would let the wire survive the overload and defeat the purpose.
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