Fuse wire has a ________ melting point and is made of an alloy of ________ and ________. If the current in a circuit rises too high, the fuse wire _________.
(a) low, lead, tin, melts (b) high, lead, tin, melts
(c) low, lead, tungsten, melts (d) low, lead, tungsten, melts
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Answer:
- low melting point
- lead and tin
- melts
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(a) low, lead, tin, melts
Explanation:
Fuse wire has a low melting point and is made of an alloy of lead and tin. If the current in a circuit rises too high, the fuse wire melts. For a fuse to be effective, it should have a low melting point, so that it melts when abnormal or high current flows through it. Thus breaking the circuit and safeguarding the circuit from the flow of the high current. The fuse wire should have high resistance. An alloy made of tin and lead have both these properties and they function as a good fuse.
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