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(a) Design and activity with the help of two nails, a very thin aluminium strip, a 12 V Battery and a key to illustrate how an electric fuse works.
(b) Cable of a microwave oven has three wires inside it which have insulation of different colour black, green and red. Mention the significance of the three colours and the potential difference between red and black one.

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(b) Red colour is for Live wire. Black colour for Neutral wire. Green colour for the Earth wire. P.D. between Red and Black wire is 220 volts.

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