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Electric Bulb and Its Working

Why rubber or...

Question

Why rubber or plastic used to cover electric wires?

A

To appear good

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B

They are insulators and do not allow electric current to pass when we touch those wires

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C

To give strength to the circuit

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D

All of the above

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Solution

The correct option is D They are insulators and do not allow electric current to pass when we touch those wires
Rubbers and plastic are used to cover electric wires because they are insulators and do not allow electric current to pass when we touch those wires.

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Q. In an electric iron being used in a household, the plastic insulation of live wire and neutral wire in the connecting cable gets torn. Due to this, naked live wire touches the naked neutral wire directly and the electric fuse of the circuit blows off.
(a) What term is used to indicate the touching of naked live wire and neutral wire directly?
(b) When the naked wires touch each other directly, what happens to the resistance of the circuit so formed?
(c) What happens to the current flowing through the wires under these conditions?
(d) Which wire connected to the body of an electric iron protects the person using this electric iron from electric shock?

Q. (a) Why must the plastic or rubber coverings from the ends of wires be removed before making connections? What is the covering called?
(b) Explain why workers of the electricity department wear rubber gloves when they work on the electric poles?

Give scientific reasons.

(a) The copper wire used in an electro-magnet is insulated.

(b) In an electric bell, the electric current stops again and again.

(c) Electrical switches are made of plastic.

(d) The fuse wire is made of a good conductor.

Q. Why are the electric wires used in homes covered with materials like plastic or rubber?

Q. Q.B. State whether true or false.
1. Plastic is an insulator.
2 Electric current can only flow in a closed circuit.
3. Bad conductors of electricity are used to cover electric wires.
4. Graphite is a conductor of electricity.

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