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The basic elements of the doorbell are as follow:

- Electromagnet

- Clapper

- Magnetic field

- Contact arm

- Bell

- Metal contact

- A Cc source

- Button

- Transformer

The electromagnet consists of a coil of wire wrapped around an iron core. The core is made of a ferromagnetic material. The clapper is the tongue of the bell which is placed just below the electromagnet. The contact arm is a thin piece of light, a conductive metal, with a thin iron bar soldered onto it. The anchored end of the contact arm is wired to an electrical circuit. The shape of the bell is rounded. One end of the electromagnet wire is connected directly to an electrical circuit. The other end of the electromagnet wire connects to a metal contact, which is adjacent to a moving contact arm. One terminal of the button is wired to a terminal on a transformer. The transformer is connected to the A C source.