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Topic : To Determine The Combined Focal Length Of The Lens System
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Acknowledgement I present my project in Physics on the topic “Automatic Light”. This project wouldn’t have been
feasible without the proper guidance of my physics teacher Mr. A.H. Khan sir who guided me throughout this project in every possible way. I would also like to extend my gratitude towards the lab assistant Tapan Nath Sir. Further I would like to thank my brothers for helping me in making the project especially in connecting the various devices.
Working Principle In order to maintain continuity in work, emergency light is very useful. It is mainly based on LDR (Light Dependent Resistor) and an IC 324. During daytime when light falls on LDR, its resistance will increase and hence, bulb will not glow. But as darkness approaches, the resistance of LDR decreases as intensity of light falling on it decreases and therefore, the bulb will glow.
LDR
IC 324
Components Required
IC Chip 324 One LDR (Light Dependent Resistor) Connecting wires Cardboard Relay 12V Transformer 2 Capacitors LED (Light Emitting Diode)
Transformer
LED
This is to certify that Jhorna Barman of class XII Science „A‟ AISSCE Roll no............... has successfully completed the project on the topic “Emergency Light” under my guidance for the academic session 2012-13. A.H.Khan P.G.T., Physics Army Public School Narangi Narangi
Certificate of authenticity Acknowledgement Topic Components required Working principle Circuit description Emergency light model/diagram Bibliography