How Does A Horn Works?
The electromagnet lies at the rear end of the horn assembly. The current is supplied to one end of an electromagnet from the positive terminal of the battery and its other end is earthed to the frame body through the contact plate arrangement.
The frame body is connected to the negative terminal of the battery and hence is called earth. Hence, connecting the second terminal of the horn to the frame completes the current flow circuit. The two contact plates which contain two small points of contact are connected to each other in the default state. A contact braking disk is fitted on the plunger and it lies in between the contact plates, as shown in the figure. As soon as we press the horn switch, the current starts flowing in the electromagnet through the contact points. This magnetize the electromagnet which attracts the plunger towards it. The plunger pulls the diaphragm with it and hence the diaphragm moves inside. As the plunger is pulled inside, the contact breaker disc pushes the contact plates apart and hence the current supply to the electromagnet stops. In absence of magnetic attraction, the diaphragm springs back to its original position. This pulls the plunger and the disc to their original position and the contact between the contact points is restored. So the current once again starts flowing through the electromagnet and the whole process is repeated again and again. During all this, the diaphragm continues it’s to and fro motion. This induced vibrations in it, which produces the sound of a definite frequency. As soon as we release the horn switch, the current flow to electromagnet stops and hence the horn sound stops.
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