SlideShare uma empresa Scribd logo
INVESTIGATORY PROJECT
PHYSICS
TOPIC:
Variation of current in LDR with the intensity of light incident on it
CERTIFICATE
This is to certify that__________________________________, a bonafide student of J.V.M
Shyamali. Ranchi, studying in class XII has successfully completed his/her physics project on the
topic “___________________________________________’’, during the session 2022-2023 as per
CBSE guidelines for the AISSCE practical examination ,2023.
Signature of teacher
Signature of Externa examiner
An LDR or photoresistor is made of any semiconductor material with high resistance. It has a high resistance
because there are very few electrons that are free and able to move, the vast majority of electrons are locked
into the crystal lattice and unable to move. Therefore in this state there is a high LDR resistance .
As the light fall on semi-conductor; the light photons are absorbed by the semi-conductor lattice and some of
their energy is transferred to the electrons. This gives some of them sufficient energy to break free from the
crystal lattice so that they can conduct electricity. This results in a lowering of the resistance of semi-
conductor and hence the overall LDR resistance. The process is progressive and as more light shines on the
LDR semi-conductor, so more electrons are released to conduct electricity and the resistance fall further.
It is a light sensitive device which is generally used to detect the presence or absence of light, and to measure
the intensity of light.
In the dark, their resistance is very high (about 1MW), but when the LDR is exposed to light, the resistance
drops down dramatically even to few Ohms, depending on the light intensity incident on it.
INTRODUCTION OF LIGHT DEPENDENT RESISTANCE(LDR)
PROCEDURE
The LDR is put in series with a voltage source (preferably variable voltage source) and a sensitive micro-ammeter
(or milli-ammeter) as shown in circuit diagram.
1. The LDR is now covered so that no light is incident on it and the reading of the milli-ammeter is noted down.
2. The reading of the milli-ammeter is noted by uncovering the LDR so that normal room light is incident on it
3. A lamp is taken which can glow in three different intensities, i.e low intensity, moderate intensity, and hight
intensity.
The reading of milli-ammeter is noted for each intensity of the lamp
mA
( k )
LDR
CIRCUIT DIAGRAM
S. No. Light Source Current(mA)
1 No light .04
2 Room Light 212
3 Lamp light (low) 230
4 Lamp light(moderate) 250
5 Lamp light(high) 300
OBSERVATION TABLE
CONCLUSIONS
We observe that there is a significant change in the current when the LDR is placed in room light as compared to
the LDR placed in dark.
We also observe that the current increases on increasing the intensity of light (by the help of lamp). The
percentage change in the current is very small due the placement of lamp. The possible reason is that the
intensity of light from lamp is very small compared to the room light.

Mais conteúdo relacionado

Semelhante a INVESTIGATORY PROJECT PHYSICS.pptx

Electron Devices Special Semiconductor Devices - LDR
Electron Devices Special Semiconductor Devices - LDRElectron Devices Special Semiconductor Devices - LDR
Electron Devices Special Semiconductor Devices - LDR
Shiny Christobel
 
A Measurements Project on Light Detection sensor
A Measurements Project on Light Detection sensorA Measurements Project on Light Detection sensor
A Measurements Project on Light Detection sensor
svrohith 9
 
Light Dependent Resistor
Light Dependent ResistorLight Dependent Resistor
Light Dependent Resistor
Bibhu Prasad Sahu
 
Ldrppt
LdrpptLdrppt
Ldrppt
Bibin Baby
 
Project
ProjectProject
LDR-experimentation.pdfpg. 1 COVENTRY UNIVERSITY .docx
LDR-experimentation.pdfpg. 1  COVENTRY UNIVERSITY .docxLDR-experimentation.pdfpg. 1  COVENTRY UNIVERSITY .docx
LDR-experimentation.pdfpg. 1 COVENTRY UNIVERSITY .docx
DIPESH30
 
ldr-171126042249.pptx
ldr-171126042249.pptxldr-171126042249.pptx
ldr-171126042249.pptx
SwarnenduDeb
 
Photoconductive Cell
Photoconductive CellPhotoconductive Cell
Photoconductive Cell
Mohamed Shaz Jaleel
 
Measuring the amount of current drawn by a load in LDR circuit when in light ...
Measuring the amount of current drawn by a load in LDR circuit when in light ...Measuring the amount of current drawn by a load in LDR circuit when in light ...
Measuring the amount of current drawn by a load in LDR circuit when in light ...
SumitDutta58
 
Shadow alarm
Shadow alarm Shadow alarm
Shadow alarm
Siddharth Jadav
 
Mini Project 1 - Wheatstone Bridge Light Detector
Mini Project 1 - Wheatstone Bridge Light DetectorMini Project 1 - Wheatstone Bridge Light Detector
Mini Project 1 - Wheatstone Bridge Light Detector
AIMST University
 
Presentation (1).pdf
Presentation (1).pdfPresentation (1).pdf
Presentation (1).pdf
AmanGupta500379
 
FA09 LDR .pptx
FA09   LDR .pptxFA09   LDR .pptx
FA09 LDR .pptx
PraneetBhandare
 
Automatic Solar night lamp
Automatic Solar night lampAutomatic Solar night lamp
Automatic Solar night lamp
Sanjush Suresh
 
AUTOMATIC LIGHT CONTROL BY USING MICROCONTROLLER BASED LDR
AUTOMATIC LIGHT CONTROL BY USING MICROCONTROLLER BASED LDRAUTOMATIC LIGHT CONTROL BY USING MICROCONTROLLER BASED LDR
AUTOMATIC LIGHT CONTROL BY USING MICROCONTROLLER BASED LDR
Nathan Mathis
 
aut street light ppt.pdf
aut street light ppt.pdfaut street light ppt.pdf
aut street light ppt.pdf
402AnnapureddySrikan
 
MW&OCOM LAB.pdf
MW&OCOM LAB.pdfMW&OCOM LAB.pdf
MW&OCOM LAB.pdf
ssuser1bbaf6
 
203979153 investigatory-project-on-ldr (1)
203979153 investigatory-project-on-ldr (1)203979153 investigatory-project-on-ldr (1)
203979153 investigatory-project-on-ldr (1)
Chiranjeet Samantaray
 
Edl_activity 1 (2).pptx
Edl_activity 1 (2).pptxEdl_activity 1 (2).pptx
Edl_activity 1 (2).pptx
allyn alax
 
night lighting using ldr and arduino uno
night lighting using ldr and arduino unonight lighting using ldr and arduino uno
night lighting using ldr and arduino uno
Hamed Raza
 

Semelhante a INVESTIGATORY PROJECT PHYSICS.pptx (20)

Electron Devices Special Semiconductor Devices - LDR
Electron Devices Special Semiconductor Devices - LDRElectron Devices Special Semiconductor Devices - LDR
Electron Devices Special Semiconductor Devices - LDR
 
A Measurements Project on Light Detection sensor
A Measurements Project on Light Detection sensorA Measurements Project on Light Detection sensor
A Measurements Project on Light Detection sensor
 
Light Dependent Resistor
Light Dependent ResistorLight Dependent Resistor
Light Dependent Resistor
 
Ldrppt
LdrpptLdrppt
Ldrppt
 
Project
ProjectProject
Project
 
LDR-experimentation.pdfpg. 1 COVENTRY UNIVERSITY .docx
LDR-experimentation.pdfpg. 1  COVENTRY UNIVERSITY .docxLDR-experimentation.pdfpg. 1  COVENTRY UNIVERSITY .docx
LDR-experimentation.pdfpg. 1 COVENTRY UNIVERSITY .docx
 
ldr-171126042249.pptx
ldr-171126042249.pptxldr-171126042249.pptx
ldr-171126042249.pptx
 
Photoconductive Cell
Photoconductive CellPhotoconductive Cell
Photoconductive Cell
 
Measuring the amount of current drawn by a load in LDR circuit when in light ...
Measuring the amount of current drawn by a load in LDR circuit when in light ...Measuring the amount of current drawn by a load in LDR circuit when in light ...
Measuring the amount of current drawn by a load in LDR circuit when in light ...
 
Shadow alarm
Shadow alarm Shadow alarm
Shadow alarm
 
Mini Project 1 - Wheatstone Bridge Light Detector
Mini Project 1 - Wheatstone Bridge Light DetectorMini Project 1 - Wheatstone Bridge Light Detector
Mini Project 1 - Wheatstone Bridge Light Detector
 
Presentation (1).pdf
Presentation (1).pdfPresentation (1).pdf
Presentation (1).pdf
 
FA09 LDR .pptx
FA09   LDR .pptxFA09   LDR .pptx
FA09 LDR .pptx
 
Automatic Solar night lamp
Automatic Solar night lampAutomatic Solar night lamp
Automatic Solar night lamp
 
AUTOMATIC LIGHT CONTROL BY USING MICROCONTROLLER BASED LDR
AUTOMATIC LIGHT CONTROL BY USING MICROCONTROLLER BASED LDRAUTOMATIC LIGHT CONTROL BY USING MICROCONTROLLER BASED LDR
AUTOMATIC LIGHT CONTROL BY USING MICROCONTROLLER BASED LDR
 
aut street light ppt.pdf
aut street light ppt.pdfaut street light ppt.pdf
aut street light ppt.pdf
 
MW&OCOM LAB.pdf
MW&OCOM LAB.pdfMW&OCOM LAB.pdf
MW&OCOM LAB.pdf
 
203979153 investigatory-project-on-ldr (1)
203979153 investigatory-project-on-ldr (1)203979153 investigatory-project-on-ldr (1)
203979153 investigatory-project-on-ldr (1)
 
Edl_activity 1 (2).pptx
Edl_activity 1 (2).pptxEdl_activity 1 (2).pptx
Edl_activity 1 (2).pptx
 
night lighting using ldr and arduino uno
night lighting using ldr and arduino unonight lighting using ldr and arduino uno
night lighting using ldr and arduino uno
 

Último

AN EMPIRE ACROSS THE THREE CONTINENTS.pptx
AN EMPIRE ACROSS THE THREE CONTINENTS.pptxAN EMPIRE ACROSS THE THREE CONTINENTS.pptx
AN EMPIRE ACROSS THE THREE CONTINENTS.pptx
kalpnayadav03021986
 
20240710 ACMJ Diagrams Set 3.docx . Apache, Csharp, Mysql, Javascript stack a...
20240710 ACMJ Diagrams Set 3.docx . Apache, Csharp, Mysql, Javascript stack a...20240710 ACMJ Diagrams Set 3.docx . Apache, Csharp, Mysql, Javascript stack a...
20240710 ACMJ Diagrams Set 3.docx . Apache, Csharp, Mysql, Javascript stack a...
Sharon Liu
 
SOFIA/HAWC+ FAR-INFRARED POLARIMETRIC LARGE-AREA CMZ EXPLORATION (FIREPLACE) ...
SOFIA/HAWC+ FAR-INFRARED POLARIMETRIC LARGE-AREA CMZ EXPLORATION (FIREPLACE) ...SOFIA/HAWC+ FAR-INFRARED POLARIMETRIC LARGE-AREA CMZ EXPLORATION (FIREPLACE) ...
SOFIA/HAWC+ FAR-INFRARED POLARIMETRIC LARGE-AREA CMZ EXPLORATION (FIREPLACE) ...
Sérgio Sacani
 
Fish in the Loop: Exploring RAS - Julie Hansen Bergstedt
Fish in the Loop: Exploring RAS - Julie Hansen BergstedtFish in the Loop: Exploring RAS - Julie Hansen Bergstedt
Fish in the Loop: Exploring RAS - Julie Hansen Bergstedt
Faculty of Applied Chemistry and Materials Science
 
Potential of Marine renewable and Non renewable energy.pptx
Potential of Marine renewable and Non renewable energy.pptxPotential of Marine renewable and Non renewable energy.pptx
Potential of Marine renewable and Non renewable energy.pptx
J. Bovas Joel BFSc
 
Potential of Marine Renewable and Non renewable energy.pptx
Potential of Marine Renewable and Non renewable energy.pptxPotential of Marine Renewable and Non renewable energy.pptx
Potential of Marine Renewable and Non renewable energy.pptx
J. Bovas Joel BFSc
 
All-domain Anomaly Resolution Office Supplement to Oak Ridge National Laborat...
All-domain Anomaly Resolution Office Supplement to Oak Ridge National Laborat...All-domain Anomaly Resolution Office Supplement to Oak Ridge National Laborat...
All-domain Anomaly Resolution Office Supplement to Oak Ridge National Laborat...
Sérgio Sacani
 
Plant Kingdom BioHack class 11 neet ....
Plant Kingdom BioHack class 11 neet ....Plant Kingdom BioHack class 11 neet ....
Plant Kingdom BioHack class 11 neet ....
anushkakharat13
 
17. 20240529_Ingrid Olesen_MariGreen summer school.pdf
17. 20240529_Ingrid Olesen_MariGreen summer school.pdf17. 20240529_Ingrid Olesen_MariGreen summer school.pdf
17. 20240529_Ingrid Olesen_MariGreen summer school.pdf
marigreenproject
 
MARIGREEN PROJECT - overview, Oana Cristina Pârvulescu
MARIGREEN PROJECT - overview, Oana Cristina PârvulescuMARIGREEN PROJECT - overview, Oana Cristina Pârvulescu
MARIGREEN PROJECT - overview, Oana Cristina Pârvulescu
Faculty of Applied Chemistry and Materials Science
 
Celebrity Girls Call Navi Mumbai 🎈🔥9920725232 🔥💋🎈 Provide Best And Top Girl S...
Celebrity Girls Call Navi Mumbai 🎈🔥9920725232 🔥💋🎈 Provide Best And Top Girl S...Celebrity Girls Call Navi Mumbai 🎈🔥9920725232 🔥💋🎈 Provide Best And Top Girl S...
Celebrity Girls Call Navi Mumbai 🎈🔥9920725232 🔥💋🎈 Provide Best And Top Girl S...
bellared2
 
Composting blue materials - Joshua Cabell
Composting blue materials - Joshua CabellComposting blue materials - Joshua Cabell
Composting blue materials - Joshua Cabell
Faculty of Applied Chemistry and Materials Science
 
MCQ in Electrostatics. for class XII pptx
MCQ in Electrostatics. for class XII  pptxMCQ in Electrostatics. for class XII  pptx
MCQ in Electrostatics. for class XII pptx
ArunachalamM22
 
Rapid pulse drying of marine biomasses - Sigurd Sannan
Rapid pulse drying of marine biomasses - Sigurd SannanRapid pulse drying of marine biomasses - Sigurd Sannan
Rapid pulse drying of marine biomasses - Sigurd Sannan
Faculty of Applied Chemistry and Materials Science
 
Structure of Sperm / Spermatozoon .pdf
Structure of  Sperm / Spermatozoon  .pdfStructure of  Sperm / Spermatozoon  .pdf
Structure of Sperm / Spermatozoon .pdf
SELF-EXPLANATORY
 
ellipticytescausesprognosistreatment-240622051139-23d50b05.pptx
ellipticytescausesprognosistreatment-240622051139-23d50b05.pptxellipticytescausesprognosistreatment-240622051139-23d50b05.pptx
ellipticytescausesprognosistreatment-240622051139-23d50b05.pptx
muralinath2
 
Pancreas_functional anatomy_enzymes.pptx
Pancreas_functional anatomy_enzymes.pptxPancreas_functional anatomy_enzymes.pptx
Pancreas_functional anatomy_enzymes.pptx
muralinath2
 
Adjusted NuGOweek 2024 Ghent programme flyer
Adjusted NuGOweek 2024 Ghent programme flyerAdjusted NuGOweek 2024 Ghent programme flyer
Adjusted NuGOweek 2024 Ghent programme flyer
pablovgd
 
Synopsis: Analysis of a Metallic Specimen
Synopsis: Analysis of a Metallic SpecimenSynopsis: Analysis of a Metallic Specimen
Synopsis: Analysis of a Metallic Specimen
Sérgio Sacani
 
Detection of the elusive dangling OH ice features at ~2.7 μm in Chamaeleon I ...
Detection of the elusive dangling OH ice features at ~2.7 μm in Chamaeleon I ...Detection of the elusive dangling OH ice features at ~2.7 μm in Chamaeleon I ...
Detection of the elusive dangling OH ice features at ~2.7 μm in Chamaeleon I ...
Sérgio Sacani
 

Último (20)

AN EMPIRE ACROSS THE THREE CONTINENTS.pptx
AN EMPIRE ACROSS THE THREE CONTINENTS.pptxAN EMPIRE ACROSS THE THREE CONTINENTS.pptx
AN EMPIRE ACROSS THE THREE CONTINENTS.pptx
 
20240710 ACMJ Diagrams Set 3.docx . Apache, Csharp, Mysql, Javascript stack a...
20240710 ACMJ Diagrams Set 3.docx . Apache, Csharp, Mysql, Javascript stack a...20240710 ACMJ Diagrams Set 3.docx . Apache, Csharp, Mysql, Javascript stack a...
20240710 ACMJ Diagrams Set 3.docx . Apache, Csharp, Mysql, Javascript stack a...
 
SOFIA/HAWC+ FAR-INFRARED POLARIMETRIC LARGE-AREA CMZ EXPLORATION (FIREPLACE) ...
SOFIA/HAWC+ FAR-INFRARED POLARIMETRIC LARGE-AREA CMZ EXPLORATION (FIREPLACE) ...SOFIA/HAWC+ FAR-INFRARED POLARIMETRIC LARGE-AREA CMZ EXPLORATION (FIREPLACE) ...
SOFIA/HAWC+ FAR-INFRARED POLARIMETRIC LARGE-AREA CMZ EXPLORATION (FIREPLACE) ...
 
Fish in the Loop: Exploring RAS - Julie Hansen Bergstedt
Fish in the Loop: Exploring RAS - Julie Hansen BergstedtFish in the Loop: Exploring RAS - Julie Hansen Bergstedt
Fish in the Loop: Exploring RAS - Julie Hansen Bergstedt
 
Potential of Marine renewable and Non renewable energy.pptx
Potential of Marine renewable and Non renewable energy.pptxPotential of Marine renewable and Non renewable energy.pptx
Potential of Marine renewable and Non renewable energy.pptx
 
Potential of Marine Renewable and Non renewable energy.pptx
Potential of Marine Renewable and Non renewable energy.pptxPotential of Marine Renewable and Non renewable energy.pptx
Potential of Marine Renewable and Non renewable energy.pptx
 
All-domain Anomaly Resolution Office Supplement to Oak Ridge National Laborat...
All-domain Anomaly Resolution Office Supplement to Oak Ridge National Laborat...All-domain Anomaly Resolution Office Supplement to Oak Ridge National Laborat...
All-domain Anomaly Resolution Office Supplement to Oak Ridge National Laborat...
 
Plant Kingdom BioHack class 11 neet ....
Plant Kingdom BioHack class 11 neet ....Plant Kingdom BioHack class 11 neet ....
Plant Kingdom BioHack class 11 neet ....
 
17. 20240529_Ingrid Olesen_MariGreen summer school.pdf
17. 20240529_Ingrid Olesen_MariGreen summer school.pdf17. 20240529_Ingrid Olesen_MariGreen summer school.pdf
17. 20240529_Ingrid Olesen_MariGreen summer school.pdf
 
MARIGREEN PROJECT - overview, Oana Cristina Pârvulescu
MARIGREEN PROJECT - overview, Oana Cristina PârvulescuMARIGREEN PROJECT - overview, Oana Cristina Pârvulescu
MARIGREEN PROJECT - overview, Oana Cristina Pârvulescu
 
Celebrity Girls Call Navi Mumbai 🎈🔥9920725232 🔥💋🎈 Provide Best And Top Girl S...
Celebrity Girls Call Navi Mumbai 🎈🔥9920725232 🔥💋🎈 Provide Best And Top Girl S...Celebrity Girls Call Navi Mumbai 🎈🔥9920725232 🔥💋🎈 Provide Best And Top Girl S...
Celebrity Girls Call Navi Mumbai 🎈🔥9920725232 🔥💋🎈 Provide Best And Top Girl S...
 
Composting blue materials - Joshua Cabell
Composting blue materials - Joshua CabellComposting blue materials - Joshua Cabell
Composting blue materials - Joshua Cabell
 
MCQ in Electrostatics. for class XII pptx
MCQ in Electrostatics. for class XII  pptxMCQ in Electrostatics. for class XII  pptx
MCQ in Electrostatics. for class XII pptx
 
Rapid pulse drying of marine biomasses - Sigurd Sannan
Rapid pulse drying of marine biomasses - Sigurd SannanRapid pulse drying of marine biomasses - Sigurd Sannan
Rapid pulse drying of marine biomasses - Sigurd Sannan
 
Structure of Sperm / Spermatozoon .pdf
Structure of  Sperm / Spermatozoon  .pdfStructure of  Sperm / Spermatozoon  .pdf
Structure of Sperm / Spermatozoon .pdf
 
ellipticytescausesprognosistreatment-240622051139-23d50b05.pptx
ellipticytescausesprognosistreatment-240622051139-23d50b05.pptxellipticytescausesprognosistreatment-240622051139-23d50b05.pptx
ellipticytescausesprognosistreatment-240622051139-23d50b05.pptx
 
Pancreas_functional anatomy_enzymes.pptx
Pancreas_functional anatomy_enzymes.pptxPancreas_functional anatomy_enzymes.pptx
Pancreas_functional anatomy_enzymes.pptx
 
Adjusted NuGOweek 2024 Ghent programme flyer
Adjusted NuGOweek 2024 Ghent programme flyerAdjusted NuGOweek 2024 Ghent programme flyer
Adjusted NuGOweek 2024 Ghent programme flyer
 
Synopsis: Analysis of a Metallic Specimen
Synopsis: Analysis of a Metallic SpecimenSynopsis: Analysis of a Metallic Specimen
Synopsis: Analysis of a Metallic Specimen
 
Detection of the elusive dangling OH ice features at ~2.7 μm in Chamaeleon I ...
Detection of the elusive dangling OH ice features at ~2.7 μm in Chamaeleon I ...Detection of the elusive dangling OH ice features at ~2.7 μm in Chamaeleon I ...
Detection of the elusive dangling OH ice features at ~2.7 μm in Chamaeleon I ...
 

INVESTIGATORY PROJECT PHYSICS.pptx

  • 1. INVESTIGATORY PROJECT PHYSICS TOPIC: Variation of current in LDR with the intensity of light incident on it
  • 2. CERTIFICATE This is to certify that__________________________________, a bonafide student of J.V.M Shyamali. Ranchi, studying in class XII has successfully completed his/her physics project on the topic “___________________________________________’’, during the session 2022-2023 as per CBSE guidelines for the AISSCE practical examination ,2023. Signature of teacher Signature of Externa examiner
  • 3. An LDR or photoresistor is made of any semiconductor material with high resistance. It has a high resistance because there are very few electrons that are free and able to move, the vast majority of electrons are locked into the crystal lattice and unable to move. Therefore in this state there is a high LDR resistance . As the light fall on semi-conductor; the light photons are absorbed by the semi-conductor lattice and some of their energy is transferred to the electrons. This gives some of them sufficient energy to break free from the crystal lattice so that they can conduct electricity. This results in a lowering of the resistance of semi- conductor and hence the overall LDR resistance. The process is progressive and as more light shines on the LDR semi-conductor, so more electrons are released to conduct electricity and the resistance fall further. It is a light sensitive device which is generally used to detect the presence or absence of light, and to measure the intensity of light. In the dark, their resistance is very high (about 1MW), but when the LDR is exposed to light, the resistance drops down dramatically even to few Ohms, depending on the light intensity incident on it. INTRODUCTION OF LIGHT DEPENDENT RESISTANCE(LDR)
  • 4. PROCEDURE The LDR is put in series with a voltage source (preferably variable voltage source) and a sensitive micro-ammeter (or milli-ammeter) as shown in circuit diagram. 1. The LDR is now covered so that no light is incident on it and the reading of the milli-ammeter is noted down. 2. The reading of the milli-ammeter is noted by uncovering the LDR so that normal room light is incident on it 3. A lamp is taken which can glow in three different intensities, i.e low intensity, moderate intensity, and hight intensity. The reading of milli-ammeter is noted for each intensity of the lamp
  • 6. S. No. Light Source Current(mA) 1 No light .04 2 Room Light 212 3 Lamp light (low) 230 4 Lamp light(moderate) 250 5 Lamp light(high) 300 OBSERVATION TABLE
  • 7. CONCLUSIONS We observe that there is a significant change in the current when the LDR is placed in room light as compared to the LDR placed in dark. We also observe that the current increases on increasing the intensity of light (by the help of lamp). The percentage change in the current is very small due the placement of lamp. The possible reason is that the intensity of light from lamp is very small compared to the room light.