NAME: BISHAL MUKHERJEE CLASS: XII B ROLL NO: SCHOOL: KENDRIYA VIDYALAYA, MALIGAON GUIDED BY: W.B. Singha
This is to certify that Bishal
Mukherjee has
satisfactorily completed the course of PHYSICS INVESIGATORY PROJECT prescribed by the CBSE under the AISSCE course in the laboratory of the school in the year of 2015-2016.
(Date)
(Signature of the teacher)
I would like to sincerely and profusely thank Miss. W.B. Singha for the valuable guidance, advice and for giving useful suggestions and relevant ideas that facilitate an easy and early completion of the project.
CONTENTS
AIM
INTRODUCTION THEORY
MATERIALS REQUIRED
EXPERIMENTAL PROCEDURE RESULT OBSERVATION PRECAUTIONS BIBLOGRAPHY
To study the working of a simple burglar alarm
Burglar (or intrusion), alarms are systems designed to detect unauthorized entry into a building or area. They consist of an array of sensors, a control panel and alerting system, and interconnections. Sensors detect intruders by many methods such as monitoring door and window contacts, by passive infrared motion detectors, ultrasound, vibration, electric or magnetic fields, or microwaves. Sensors may be directly wired to a control panel that provides sensor power, or may communicate wirelessly. Burglar alarms (or perimeter security systems, perimeter detection systems, Perimeter protection, intrusion detection systems and other terms for the same thing) are used in residential, industrial, and commercial properties for protection against theft or property damage.
Theory What is a burglar alarm? Basically, the burglar alarm is a device that monitors the designated area or areas to detect the presence of suspicious elements. The system takes the help of the sensor to detect such elements. Once found, the system sends emergency signals to the user or to the monitor station if the user so intends.
How the entire system works? The work of the home security system begins with the sensors and motion detectors. These devices are installed in different places that they monitor in their own ways. However, they send emergency signals to the control panel once they detect something that surpasses their tolerance level.
Materials Required
1. An appropriate circuit diagram was made which showed the appropriate placement of components. 2. The circuit was completed with the appropriate application of LDR.
A photoresistor or light-dependent resistor (LDR) or photocell is a light-controlled variable resistor. The resistance of a photoresistor decreases with increasing incident light intensity; in other words, it exhibits photoconductivity.
The burglar alarm circuit is made in accordance with the circuit diagram which uses an LDR and buzzer and thus a high pitch frequently varying sound is produced. It can be used in different ways depending upon the requirement.
It can be used in many ways: 1. It can be used as a siren in the police vehicles, fire brigade vehicles and ambulances as it attracts the attention of the people on the road immediately. 2. It can also be used as a security system in banks and other such places to alert the police. 3. It can also be used as a part of a burglar alarm system as its frequently varying high pitch sound grabs the attention of the nearby people as well as alerts the burglar. 4. It can be used as a call bell. 5. It can be fitted in the vehicles of the VIPs.
1. All the plugs and connections should be neat, clean, and tight. 2. All the components should be working and checked. 3. The current source should be adjustable.
Comprehensive Laboratory Manual in Physics.
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