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Practica de laboratorio con LDR
Vindhyanagar,Singrauli (M.P.) SESSION-2014-15 A.I.S.S.C.E.-2014-15 SUBMITTED BY
NAME CLASS ROLL NO. NAME OF THE PROJECT Mr. R. K. Dwivedi Teacher Physics Department Delhi Public School, Vindhyanagar
: : : :
Arohan Kumar XII 1715555 PREPARATION OF STREET LIGHT USING LDR Dr. J. Pandey Pricipal Delhi Public School, Vindhyanagar
ACKNOWLEDGEMENT DECLARATION CERTIFICATE WHY A PROJECT AIM OF THE PROJECT PARTS LIST EXPLANATION BIBLOGRAPHY
I would like to express my gratitude to Mr. R. K. Dwivedi, Teacher,
Physics
Vindhyanagar
Department,
Delhi
Public
School,
under whose supervision and guidance the
work was taken up and completed. I am grateful to Dr. J. Pandey, Principal, Delhi Public School, Vindhyanagar for providing all facilities and cordial atmosphere which went to long way in completing this project work. I must express my thankfulness towards all the staff and attendants of Physics Laboratory without the help of whom this work would have never been completed. I extend my sincere thanks to my classmates for all valuable assistance and co-operation during the course of work.
Arohan Kumar Roll no. 1715555 Class-XII
This is to certify that Mr. Arohan Kumar of class 12th has completed the project with sincerity and obedience. He has completed his Project work before the end of tenure. I assume that he did not resort to any unfair means and the project has been completed with full determination. I also declare that he is well behaved and hard working to the best of my knowledge. This project may be considered as fulfillment for
All India Senior School Certificate Examination 2014 conducted by
CBSE, New Delhi. He has also not restored to any unfair means & has done the project with sincerity.
Mr. R. K. Dwivedi H.O.D. Physics Department Delhi Public School, Vindhyanagar
Dr. J. Pandey Pricipal DelhiPublicSchool, Vindhyanagar
I hereby declare that with the able guidance and kind suggestions of my respected Physics teacher
Mr. R. K. Dwivedi Teacher Physics Department Delhi Public School, Vindhyanagar
This project is as per the guidelines issued by CENTRAL BOARD OF SECONDARY EDUCATION FOR ALL INDIA SENIOR SECONDRY SCHOOL CERTIFICATE EXAMINATION
Arohan Kumar Class-XII (SCIENCE)
The project method of learning is the best manner
through
which
student,
specially
a
science student can apply the knowledge he gains from the classroom and lectures to his daily life. He not only learns how to solve the problems but also starts taking keen interest in everything that he does in the laboratory. This
method
enables
the
students
to
understand the significance and relevance of the subject in his daily life and allows him to choose his objectives. A project is define as “a whole hearted purposefully
activity
proceeds
in
a
social
environment”, by Dr. Kilpartik. By doing a project, student displays his spirit of enquiry and activity or improving the existing ways of solving a problem through understanding situations, independent thinking and ability to understand basic facts.
PREPARATION OF STREET LIGHT USING LIGHT DEPENDENT RESISTOR
Transistor -- BC547 Light dependent resistor Resistors--330R, 1k Led 6/9 volt battery
A transistor is an electronic device which has three terminals and can be used as electronic switch and signal amplification. Here is an example of transistor as a switch which is designed by me. AUTOMATIC STREET LIGHT Automatic street light is the automatic switching device which glows at night automatically and turns off automatically at day. The following diagram shows the schematics of automatic street light.
The automatic street light functions as switch. To understand this let us view the following diagrams.
During day time, the ldr or light dependent resistor has minimum resistance and a little current flows through it. it results the biasing of transistor bc547 and the current flows through it due to the sufficient charge carrier at base. so the potential drop across the transistor is zero and at that time light doesn't glow. so at day time light turns off.
During night time, the resistance of the ldr is very high so that the current doesn't flow through it and the transistor doesn't get base biasing. so the current doesn't flow through transistor bc547 and the voltage across it is maximum. so the current flows through led and the led glows. So at night the light glows.
