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(a) Of what substance is the fuse wire made? Why?
(b) Explain why, a copper wire cannot be used as a fuse wire.
(a) The substance used in the making of a fuse wire is tin-plated copper because it has a low melting point. If the current exceeds a safe value, the wire melts and breaks the circuit.
(b) A copper wire cannot be used as a fuse wire because it has a high melting point, and due to this, it will not melt easily in case of a short circuit.
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- What is a fuse wire?
- How does use of a fuse wire protect electrical appliances?
- How does fuse wire protect electrical appliances?
- Which property of a conducting wire is utilised in making electric fuse?
- Explain the importance of using in a household electric circuit (i) fuse, and (ii) earthing wire.
- In household circuits, is a fuse wire connected in series or in parallel?
- Fill in the following blanks with suitable words:(a) A fuse should always be placed in the ........... wire of a mains circuit. (b) The earth wire should be connected to the ........... of an appliance.
- What is the usual colour of the insulation of (a) live wire(b) neutral wire, and (c) earth wire?
- When an electric current flows through a copper wire AB as shown in figure, the wire$(a)$. deflects a magnetic needle placed near it$(b)$. becomes red hot$(c)$. gives electric shock$(d)$. behaves like a fuse"
- (a) Why are fuse fitted in the fuse box of a domestic electricity supply?(b) What device could be used in place of the fuses?
- A 3-pin mains plug is fitted to the cable for a 1 kW electric kettle to be used on a 250 V a.c. supply. Which of the following statements is not correct?(a) The fuse should be fitted in the live wire (b) A 13 A fuse is the most appropriate value to use (c) The neutral wire is coloured black (d) The green wire should be connected to the earth pin.
- Along with live wire and neutral wire, a third wire is also used in domestic electric wiring. What name is given to this third wire?
- A thick wire is hanging from a wooden table. An anticlockwise magnetic field is to be produced around the wire by passing current through this wire by using a battery. Which terminal of the battery should be connected to the:(a) top end of wire? (b) bottom end of wire? Give reason for your choice.
- In the straight wire A, current is flowing in the vertically downwards direction whereas in wire B the current is flowing in the vertically upward direction. What is the direction of magnetic field:(a) in wire A?(b) in wire B?Name the rule which you have used to get the answer.
- (a) Explain why, it is more dangerous to touch the live wire of a mains supply rather than neutral wire.(b) Why is it safe for birds to sit on naked power lines fixed atop tall electric poles?
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