Use of Electro Magnet Electric bell


 
 
Concept Explanation
 

Use of Electromagnet Electric bell

Electromagnet

It is a magnet made by using electric current. An electromagnet works on the magnetic effect of current. 

Use of electromagnet:

  • Electromagnets are used in cranes to pick up cars in scrap yard and also to separate iron from garbage dump.
  • They are also used in loudspeakers, telephones, and in electric motors which are used in electric fans, washing machines, refrigerators, etc. electromagnets are also used in electric bell.
  •  These magnets have their utilization in electric generators where very strong magnetic field is required.
  •  For deflection electron beam of the picture tube of TV,electromagnets are used.
  •  For magnetic separation of iron ores form the earthy substances, electromagnets are used.
  •  For preparing strong permanent magnets, electromagnets are used.
  • Used for separating pieces of iron from wounds.
  • Electromagnet are also used loading furnaces with iron.
  • It is also used in research to study the magnetic properties of a substance in a magnetic field .
  • Electric Bell:

    An electric bell has an electromagnet that pulls a strip of iron which makes the hammer hit the gong to ring the bell.

    Construction : 

    The electric bell has a U shaped electromagnet. There is a small iron bar called armature which is held in front of the poles of the electromagnet.The lower end of iron bar is attached to a flat spring and the flat spring is itself fixed to a metal bracket. The upper end of iron bar has a clapper attach to it. A metal gong is fixed near the clapper.

    Working :

    Step 1 . When you push the switch of the bell, an electric current flows through the electromagnet.

    Step 2 . The electromagnet attracts the soft iron strip. The hammer attached to the strip then hits the gong, making it ring.

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    Sample Questions
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    Question : 1

    Which of the following are correct :

    (a)  Electromagnets are used in cranes to pick up cars in scrap yard and also to separate iron from garbage dump.

    (b) Electromagnets are used for or preparing strong permanent magnets.

    (c) Electromagnets are used for magnetic separation of iron ores form the earthy substances.

    Right Option : D
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    Explanation
    Question : 2

    The electric bell has a ___________ electromagnet.

    Right Option : C
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    Explanation
    Question : 3

    ____________________ produces sound energy using electrical energy.

    Right Option : A
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    Explanation
     
     


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