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What is a fuse wire? What is the advantage and disadvantage of using a thick fuse wire?

A fuse is a very important device used for protecting electric circuits. It is a wire made out of a metal like tin or tin alloy having a very low melting point. When a high current flows through a circuit, the fuse wire gets heated or melts due to short-circuiting or overloading. Hence the circuit is broken and the current stops flowing. This saves all the appliances of the circuit.

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30 With the help of a labelled diagram, explain the working of an A.C. generator. 31 Explain the principle, construction and working of a DC Motor. 33 The device used for producing current is called a,
(i) Generator
(ii) Voltmeter
(iii) Ammeter
(iv) Galvanometer. 34 What are magnetic field lines? How is the direction of a magnetic field at a point determined? Mention two important properties of the magnetic field lines.