Single correct option
The material used for making the fuse wire in electrical circuits should have
- A. low melting point and high resistivity
- B. high melting point and low resistivity
- C. high melting point and high resistivity
- D. low melting point and low resistivity
Show answer and solution
Answer: (A) low melting point and high resistivity
A fuse protects a circuit by melting when the current exceeds a safe limit. Heat produced is I²R, so a high resistivity helps heating, and a low melting point lets the wire melt quickly and break the circuit. Typical fuse wire is a tin-lead alloy. A high melting point would let the wire survive and fail to protect.
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