STUDY OF BURGLAR ALARMNAME: 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) . .B. Singha for the valuable guidance.I would like to sincerely and profusely thank Miss. advice and for giving useful suggestions and relevant ideas that facilitate an easy and early completion of the project. W. CONTENTS AIM INTRODUCTION THEORY MATERIALS REQUIRED EXPERIMENTAL PROCEDURE RESULT OBSERVATION PRECAUTIONS BIBLOGRAPHY . To study the working of a simple burglar alarm . a control panel and alerting system.Burglar (or intrusion). Sensors detect intruders by many methods such as monitoring door and window contacts. industrial. vibration. and interconnections. and commercial properties for protection against theft or property damage. electric or magnetic fields. or may communicate wirelessly. or microwaves. alarms are systems designed to detect unauthorized entry into a building or area. Burglar alarms (or perimeter security systems. by passive infrared motion detectors. intrusion detection systems and other terms for the same thing) are used in residential. Sensors may be directly wired to a control panel that provides sensor power. Perimeter protection. . ultrasound. perimeter detection systems. They consist of an array of sensors. the burglar alarm is a device that monitors the designated area or areas to detect the presence of suspicious elements. they send emergency signals to the control panel once they detect something that surpasses their tolerance level. . However.Theory What is a burglar alarm? Basically. Once found. These devices are installed in different places that they monitor in their own ways. The system takes the help of the sensor to detect such elements. 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. Materials Required . 2. . The resistance of a photoresistor decreases with increasing incident light intensity. in other words.1. it exhibits photoconductivity. An appropriate circuit diagram was made which showed the appropriate placement of components. 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. It can be used in different ways depending upon the requirement. .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. 4. It can be fitted in the vehicles of the VIPs. It can also be used as a security system in banks and other such places to alert the police. fire brigade vehicles and ambulances as it attracts the attention of the people on the road immediately. 3. 2. It can be used as a siren in the police vehicles. 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.It can be used in many ways: 1. 5. It can be used as a call bell. . All the plugs and connections should be neat. All the components should be working and checked. 2.1. . and tight. clean. 3. The current source should be adjustable. Wikipedia .The Free Encyclopaedia Google Images YouTube . Comprehensive Laboratory Manual in Physics.