Points : Circuit, Working Definition One end of the winding is connected to I terminal T1 and the other to a spring, which is, mounted armature. A rod is attached to the armature, the free end of the rod carries a small hammer which can strike against a bell. A very light spring is attached to a contact adjusting screw which is joined to second terminal T2 by a wire.
The electric circuit is completed through a battery and push switch button connected to the terminals T1 and T2. Working 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. Due to this, armature is brought back by the spring to its original position. Contact of the spring with the screw is now remade which completes the circuit. This 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.
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