Question

explain the construction and working of electric bell

Answer 1

Important parts of electric motor are:-
1) Electromagnet
2) Armature
3) Armature rod
4) Spring
5) Hammer
6) Gong

Construction:-
One end of armature winding is connected to terminal T1 and the other to a spring which is mounted on a soft iron strip. A rod is attached to to the armature and the free end of the rod carries a small hammer, which strikes a bell. A very light spring is attached to a screw which is joins to Terminal T2.

Working:-
 The electric circuit is completed through a battery and push switch button connected to the terminal T1     and T2. When the push button is pressed the electric circuit is completed and the armature is attracted     towards the electromagnet as a result, the small spring gets detached from the screw due to which the     electric circuit is broken and the electromagnet is demagnetized. Hence, the attraction disappears and     the armature is brought back by the spring to its original position. Contact of the spring with the screw is     now remade, which completes the electric circuit. The action is repeated over and over again     consequently. The armature vibrates and hammer attached to it strikes the gong and the bell rings and     sound is produced.