Question
(a) What does MCB stand for? Explain the working of MCBs. Why are they preferred over fuses?
(b) Name the principle on which electric fuse works?
[3 MARKS]
(b) Name the principle on which electric fuse works?
[3 MARKS]
Answer:
:
Part (a) : 2 Marks
Part (b) : 1 Mark
(a) MCB stands forMiniature circuit breakers.
MCBs are basically a substitute for fuses.These are switches which automatically turn off when the current in a circuit exceeds the safe limit. We turn them on and the circuit is once again complete.
They are preferredover fuses because they are much more user-friendly, because if there is excess current in the circuit they automatically turn off, and the circuit is complete again if we turn it on. While in afuse, the fuse has to be replaced once excess current passes through it.
(b)Electric fuse works on the principle of the heating effect of current.
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:
Part (a) : 2 Marks
Part (b) : 1 Mark
(a) MCB stands forMiniature circuit breakers.
MCBs are basically a substitute for fuses.These are switches which automatically turn off when the current in a circuit exceeds the safe limit. We turn them on and the circuit is once again complete.
They are preferredover fuses because they are much more user-friendly, because if there is excess current in the circuit they automatically turn off, and the circuit is complete again if we turn it on. While in afuse, the fuse has to be replaced once excess current passes through it.
(b)Electric fuse works on the principle of the heating effect of current.
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