How does a Burglar Alarm System work

Just a brief introduction on how a burglar alarm system work

Alarms have alarm detectors installed on the windows and doors. These are small pieces w hich, when the window or door is closed, maintain an electrical connection. If the connection is broken, it will trigger the system.

Actually the operation of a burglar alarm is the same that of an electric circuit. In order further understanding to know about burglar alarms and how they work, one has to compare them to a simple electric circuit or appliance. This principle works switch to turn of the lights is the similiar way with burglar alarms. The only difference is that the movements of an intruder will be detected by the switch. If an intruder breaks in a house through a door or window, his movements will be detected by a switch which will trigger the burglar alarm.

There are 2 categories of circuits:-

1. The closed-circuit
   when a door or window is shut, the electric circuit is closed. This means that electricity can flow from one end to another in the circuit. But when the door or window is opened by an intruder, the circuit will be open, thus the alarm will be triggered
2. The open-circuit system
   works opposite in an open-circuit system. The alarm will instead be triggered when the door or window is closed. The alarm will sound once the circuit is closed.

Beside circuit, the burglar alarm system work with magnetic sensor. The magnetic sensor is composed of:

1. A battery that is powering the circuit
2. A spring-driven switch made of metal that is built onto a door or window frame
3. A magnet that is embedded in the door or window, also lined up with the switch
4. A buzzer that is powered separately with a relay-driven switch

The control box is hooked up to one or more alarm circuits, but it also has its own power supply. Once the alarm is triggered, the control box won't cut it off until somebody enters a security code at a connected keypad. In most installations the control box is kept in a veered place so that the burglar can't even think of disabling it then the alarm goes off.

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