electric bell project pdf
#1

Hi am  Amal i would like to get details on electric bell project pdf and i last studied in the college/school  and now am doing  research .i need help
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#2
An electric bell is a mechanical bell operated by means of an electromagnet. When an electric current is applied, a repetitive hum or sounds will occur. Electric bells have been widely used in railroad crossings, on telephones, fire alarms and thieves, such as school bells, bells and alarms in industrial plants, since the late 19th century but are now being widely replaced with probes Electronic communications. It consists of insulated wire coils wrapped round iron bars. When an electric current flows through the coils, the bars become magnetic and attract a piece of iron attached to a clapper. The bell strikes the bell and makes it ring.


working

The most used form is the switch bell, which produces a continuous sound when current is applied. See animation, above. The bell or gong (B), often in the shape of a cup or half sphere, is struck by an arm (A) with a spring with a metal ball at the end called a clapper, operated by an electromagnet). In its rest position, the flap is kept away from the bell at a short distance by its elastic arm. When an electric current is allowed to pass through the electromagnet winding (by closing the switch (K), ie by pressing the door bell), a magnetic field is created which attracts the iron arm of the flap, Bell This opens a pair of electrical contacts (T) attached to the arm of the clapper, interrupting the current to the electromagnet. The magnetic field of the electromagnet collapses, and the clapper moves away from the bell. This again closes the contacts, allowing the current to flow back to the electromagnet, so that the magnet pushes the lever to strike the bell again. This cycle repeats quickly, many times per second, resulting in a continuous touch.

The tone of the sound generated depends on the shape and size of the bell or gong resonator. When several bells are installed together, they can be given distinctive rings using different sizes or shapes of gong, despite the fact that the strike mechanisms are identical.

Another type, the one-move bell, has no interrupting contacts. The hammer hits the gong once every time the circuit is closed. These are used to point out brief notifications, such as a store door opening for a customer, rather than continuous warnings.

It can be understood in the following video:


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