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What is the role of fuse, used in series with any electrical appliance?

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What is the role of fuse, used in series with any electrical appliance? Why should a fuse with a defined rating not be replaced by one with a larger rating?

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  • Fuse has have thin wire of short length made of tin and lead in the ratio of 75: 25%. 
  • When current exceeds specified limit fuse melts and breaks the circuits thereby protecting home appliances.
  • If a fuse is replaced by one with larger ratings, the appliances may get damaged while the protecting fuse does not burn off. 
  • This practice of using fuse of improper rating should always be avoided.
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