Q6 of 20 Page 77

Which property of a conducting wire is utilized in making electric fuse?

Electric fuse is made from the wires which have a low melting point as when a large current passes through it, it melts quickly and breaks the circuit. This helps in to prevent damage to the electrical appliance. Some material used to make fuse are alloys of zinc, copper, silver & aluminum.


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4

When a switch is in OFF position,

(i) circuit starting from the positive terminal of the cell stops at the switch.


(ii) the circuit is open.


(iii) no current flows through it.


(iv) current flows after some time.


Choose the combination of correct answer from the following.

 5

Which of the following precautions need not be taken while using electric gadgets/appliances/circuit?

 7

Name the device used these days in place of electric fuses in electrical circuits.

 8

Fill in the blanks:

(i) Our body is a ________________ of electricity.


(ii) An electric cell produces electricity from the __________ ___________ in it.


(iii) In an electric circuit a fuse is a _________ _______ to prevent possible fire.


(iv) A combination of two or more cells is called a _________.