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The Doorbell
In a doorbell circuit , the doorbell button is a switch; pushing and holding it down serves to connect
the circuit to the household ac source through an appropriate step-down transformer. The current from the source
flows through the electromagnet, via a contact arm with only one end anchored in place (and the other movable), and
onward to the switch. The magnetic field generated by the current flowing in the windings of the electromagnet pulls
the unanchored end of the contact arm (which has an iron bar on it) closer in, in the direction of the electromagnet,
thereby losing connection with the metal contact and severing current flow in the circuit. With no magnetic field to pull
on the contact arm, it snaps back into its earlier position, re-establishing the current in the circuit. This back and forth
cycle is repeated many times per second, so long as the doorbell button continues to be pushed down, and with every
cycle, the clapper arm attached to the contact arm hits the metal bell and generates a ringing sound.