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The working principle of car horn

The car horn generates sound through the vibration of the metal diaphragm. The car horn is composed of iron core, electromagnetic coil, contact, armature, diaphragm, etc. When the driver presses the horn switch, current flows through the coil through the contacts, and the coil generates magnetic force to attract the armature, thereby forcing the diaphragm to move. The armature moves to open the contacts, the current is interrupted, and the magnetic force of the coil disappears. The diaphragm is elastic and spring. Under this action, it returns to the original position together with the armature, the contact closure circuit is connected again, the current flows through the coil through the contact to generate magnetic force, and the above action is repeated. In this way, the diaphragm keeps vibrating and produces sound. The sound board is rigidly connected to the diaphragm, which can make the vibration stable and make the sound more pleasing (ie the principle of electromagnet)

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