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ELECTRIC BELL

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ELECTRIC BELLAn electric bell is a mechanical bell that functions by means of an electromagnet. When an electric current is applied, it produces a repetitive buzzing or clanging sound. Electric bells have been widely used at railroad crossings in telephones fire and burglar alarms as school bells doorbells and alarms in industrial plants, but they are now being widely replaced with electronic sounders.

TYPES OF ELECTRIC BELLS

1)Interrupter bells2)Buzzers3)Single-stroke bells4)Telephones5)Fire alarms

INTERRUPTER BELLSInterrupter Bells. The most widely used form is the interrupter bell, which produces a continuous sound when current is applied. The bell or gong, which is often in the shape of a cup or half-sphere, is struck by a spring-loaded arm with a metal ball on the end called a clapper, actuated by an electromagnet.

An electric buzzer uses a similar mechanism to an interrupter bell, but without the resonant bell. They are quieter than bells, but adequate for a warning tone over a small distance, such as across a desktop.A buzzer or beeper is an audio signaling device, which may be mechanical, electromechanical, or piezoelectric..

BUZZERS

SINGLE-STROKE BELLS

Single stroke bells produce an individual, clearly defined note. When current is applied, the striker hits the gong once and stops. Coded, intermittent current may be used to cause the striker to hit the gong, pause and hit again for any given period. Ideal for use with momentary initiating contacts.

Device that coverts sound and electrical waves into audible relays, and is used for communication. The telephone consists of two essential parts; a microphone and a speaker.

TELEPHONES

FIRE ALARMSA device making a loud noise that gives warning of a fire.

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