An electric bell works by flowing current electrical circuit and threw a pressing screw. The screw is in contact with another metal (iron) that is magnetic and is attracted by an electro-magnet iron series with a hammer and the hammer hits the Witch Gong makes noise.

So far so good, but you only describe half history. "… Once the piece of metal has been attracted by the electromagnet, the contact between the screw and the metal part is interrupted, it returns to its original position. There he makes contact again, and the process continues to repeat itself …." That's why you do not just get dinnggg "noise, but a" rrrringg. You speak of a bell, not a gong, are you? " Because the "ding-dong" bell work in a different way ….

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