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Q108
(IAS/1998)
Science & Technology › Basic Science (Physics, Chemistry, Biology) › Electricity and magnetism
Answer Verified
A fuse is used in main electric supply as a safety device. Which one of the following statements about the fuse is correct?
Result
Your answer:
—
·
Correct:
C
Explanation
Option (3) is correct. A fuse is a deliberately weak link placed in series with the circuit so that all circuit current passes through its fusible element; when excessive current flows the element heats and melts, breaking the circuit [1]. Fuses are therefore made from metals or alloys chosen for an appropriate (relatively low) melting point so they open reliably under overloads and short circuits; design aims for materials that melt easily and extinguish arcs when they do so. By contrast, a fuse is not connected in parallel and is not intended to have very high resistance during normal operation (it must conduct normally until melting) [2].
Sources
- [1] Science , class X (NCERT 2025 ed.) > Chapter 11: Electricity > 11.7.1 Practical Applications of Heating Effect of Electric Current > p. 190
- [2] Science , class X (NCERT 2025 ed.) > Chapter 11: Electricity > Activity 11.3 > p. 179
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