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After several years of great business success, Edwin Holmes, the man who first made burglar alarms a necessity to security, sold his company to the American Telephone and Telegraph Company (AT&T) in 1905. AT&T brought the burglar alarms into the world of emergency call systems employed by both police and fire departments, and the rest, as they say, is history.

Over the years as alarm systems became cheaper, burglar alarms have become a standard feature of commercial establishments and residences. Despite the increasing widespread use of burglar alarms, how many of us know how these machines actually work? This article hopes to impart a few basic facts about burglar alarms in particular on how they work, components of a burglar alarm system, and reasons for investing.

The inner workings of burglar alarms are comparable to a simple electric light bulb. The main difference falls on how to turn them on: a light bulb requires a person to press the light switch to on while a burglar alarm detects movement buy meridia online of an intruder) for it to be activated. Hence, if a door is forcibly opened, the motion of the intruder will be detected triggering the burglar alarm to sound off. An electric circuit system is either a closed-circuit or an open-circuit type. In a closed-circuit, when a door is shut, the electric circuit is also closed implying that electricity is able to pass through the circuit. However, when the door is ajar, the circuit becomes open, disrupting the electric flow, thus, activating the alarm.

The reverse is true for an open-type circuit system. The burglar alarm becomes activated when the circuit is closed.

How does the alarm system detect movement? This is through the use of magnetic sensors. A magnetic sensor consists of a battery serving as power source, a spring-switch, a magnet embedded in the door, and a buzzer. Once motion is detected, the magnetic sensor sends signals via the control box, which, in turn, transmits signals to the alarm device. The sounding off of the alarm aims to scare off the intruder. There are also more sophisticated burglar alarms equipped with control boxes that are actually linked to the police alerting the station of the intruder.

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