More details about the electric bell
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when the electric switch is pressed, the circuit is complete and a current flows through the electromagnet. The soft iron armature is attracted towards the electromagnet and the hammer hits the gong. this movement breaks the circuit , so that the current stops flowing and switches off the electromagnet. The springy metal strip pulls the bar back, so that contact is made again and the circuit becomes complete. This keeps repeating and hammer strikes the gong producing a ringing sound as long as the switch is pressed.
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