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Metal used to make wires for safety fuses must have

  • A.Low resistivity and low melting point
  • B.High resistivity and high melting point
  • C.High resistivity and low melting point
  • D.Very low resistivity and high melting point

Answer: C

Fuse wire must have high resistivity and a low melting point.

High resistivity makes it the hottest point in the circuit for a given current, and a low melting point makes it part before the wiring behind it is damaged. A tin–lead alloy meets both conditions.

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