Question

1.4 Explain the working of electric fuse and miniature circuit breaker (MCB)
1.5 a) What is the nature of sound waves? How it propagates through air.
b) Explain the characteristics of sound waves produced by different musical instrumen​

Answer 1

Answer:

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Answer 2

Answer:

A electric fuse works on the heating effect of electric current.MCB works on the magnetic effect of current.

Explanation:

fuse works as follows:A fuse wire is connected on series in the electric circuits.when a short circuit takes place ,or when overloading takes place, the current becomes large and heats the fuse wire too much .since the melting point of fuse is much lower than copper wires , the fuse wire melts and breaks the circuit .when the fuse wire breaks,electricity supply is automatically switched off before any damage can be done to the rest of the wiring. That sit.MCB works as follows:the miniature circuit breaker puts off a switch cutting off the electric supply. Miniature circuit braker (MCB) contains an electromagnet which ,when the current exceeds the rated value of circuit breaker,becomes strong enough to separate a pair of contacts (by putting off a switch) and breaks the circuit. That sit