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Q4 Week 5

Week 5 Reviewer

TermDefinition
Signal and Alarm A mechanism that gives an audible, visual, or other kind of signal to alert people to a problem or condition that requires urgent attention.
Signal and Alarm System: Wiring The conductor commonly uses No. 18 or 16 copper wires (solid or stranded).
Electric bell an alarm that produces an audible alarm tone when electrical energy is applied.
Electromagnet (N\S) a magnetic wire wound around the insulated soft iron bolt; it produces strong magnetic attraction.
Hammer or beater (striker) is a small ball attached to the armature which strikes the gong.
Gong bell A concave disc that produces loud sound when stuck by the hammer.
Adjustable contacts It serves as the contact switch to the spring.
Buzzer an alarming device that produces a buzzing sound which is caused by the rapid vibration of armature.
Novel Buzzer uses a relay in series with a small audio transformer and speaker. When the switch is pressed, the relay will operate via the transformer primary and closed relay contact.
Annunciator is a device used to indicate by visual sign that transmit over electric call bell circuit.
Burglar Alarm The improvement of call bell and annunciator system
The Open-Circuit Alarm System all switches are open: are installed on doors, window, switches that automatically open and close as soon as the door or window is forced to open causing the bell to ring.
The Closed-Circuit Burglar Alarm all switches are closed: when the doors and window are forced to open, the switches will automatically open which causes the relay to be energized and complete the bell circuit that makes it ring.
Metal Strip Part of buzzer with strip thin sheet of electromagnetic materials which vibrates when electromagnet is energized and produces a buzzing sound.
Created by: Teacher Meow
 

 



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