How does the magnetic effect of electric current help in the
working of an electric bell? Explain with the help of a diagram
Boojho made an electromagnet by winding 50 turns of wire
over an iron screw. Paheli also made an electromagnet by
winding 100 turns over a similar iron screw. Which electro
magnet will attract more pins? Give reason.
Why do we cover plug pin holes which are within the reach of
children with cellotape or a plastic cover when not in use?
Name two electric devices for each where (i) heating effect of
current is used and (ii) magnetic effect of current is used.
Can we use the same fuse in a geyser and a television set?
Explain.
Why are compact fluorescent lamps (CFLs) preferred over
electric bulbs?
Paheli does not have a night lamp in her room. She covered
the bulb of her room with a towel in the night to get dim light.
Has she taken the right step? Give one reason to justify your
answer
Unscramble the following words:
(i) TBTAYER
(ii) SFEU
(iii) HTRCO
(iv) HICWTS
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 _________.
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