Objective: Record the characteristic curve for a photoresistor
Photoconductivity utilises absorption of light by means of the inherent photoelectric effect in a semiconductor to create electron-hole pairs. One specific semiconductor mix which exhibits the photoelectric effect particularly strongly is cadmium sulphide. This material is used in the construction of photoresistors. In this experiment, a CdS photoresistor is illuminated with white light from an incandescent bulb. The intensity of this illumination of the photoresistor is then varied by crossing two polarising filters placed one behind the other in the beam.
![Experiment: Photoconductivity (230 V, 50/60 Hz), 8000776 [UE6020400-230], Conduction Phenomena](/imagelibrary/UE6020400-230/UE6020400-230_01_Experiment-Photoconductivity-230-V-5060-Hz.jpg)
![Experiment: Photoconductivity (230 V, 50/60 Hz), 8000776 [UE6020400-230], Conduction Phenomena](/thumblibrary/UE6020400-230/UE6020400-230_01_1200_1200_Experiment-Photoconductivity-230-V-5060-Hz.jpg)
![Experiment: Induction in a Moving Conductor Loop, Basic equipment (230 V, 50/60 Hz), 8000628 [UE3040200-230], Induction](/thumblibrary/UE3040200-230/UE3040200-230_01_140_140_Experiment-Induction-in-a-Moving-Conductor-Loop-Basic-equipment-230-V-5060-Hz.jpg)
![Pair of Safety Experiment Leads, 75 cm, blue, red, 1017718 [U13816], Experiment Leads and Cables](/thumblibrary/U13816/U13816_01_140_140_Pair-of-Safety-Experiment-Leads-75-cm-blue-red.jpg)
![DC Power Supply 20 V, 5 A (230 V, 50/60 Hz), 1003312 [U33020-230], Power Supplies](/thumblibrary/U33020-230/U33020-230_01_140_140_DC-Power-Supply-20-V-5-A-230-V-5060-Hz.jpg)
![Set of 15 Safety Experiment Leads, 75 cm, 1002843 [U138021], Circuits](/thumblibrary/U138021/U138021_01_140_140_Set-of-15-Safety-Experiment-Leads-75-cm.jpg)
![Pocket Measuring Tape, 2 m, 1002603 [U10073], Measurement of Length](/thumblibrary/U10073/U10073_01_140_140_Pocket-Measuring-Tape-2-m.jpg)
![Digital Multimeter P1035, 1002781 [U11806], Hand-held Digital Measuring Instruments](/thumblibrary/U11806/U11806_01_140_140_Digital-Multimeter-P1035.jpg)
![Convex Lens on Stem f =+150 mm, 1003024 [U17103], Optical Components on Stem](/thumblibrary/U17103/U17103_01_140_140_Convex-Lens-on-Stem-f-150-mm.jpg)
![Polarisation Filter on Stem, 1008668 [U22017], Optical Components on Stem](/thumblibrary/U22017/U22017_01_140_140_Polarisation-Filter-on-Stem.jpg)
![DC Power Supply 0-500 V (230 V, 50/60 Hz), 1003308 [U33000-230], Power Supplies](/thumblibrary/U33000-230/U33000-230_01_140_140_DC-Power-Supply-0-500-V-230-V-5060-Hz.jpg)
![High Voltage Power Supply 5 kV (230 V, 50/60 Hz), 1003310 [U33010-230], Power Supplies](/thumblibrary/U33010-230/U33010-230_01_140_140_High-Voltage-Power-Supply-5-kV-230-V-5060-Hz.jpg)
![LDR 05 Photoresistor, 1012940 [U333048], Plug-In Component System](/thumblibrary/U333048/U333048_01_140_140_LDR-05-Photoresistor.jpg)
![Adjustable Slit on Stem, 1000856 [U8474015], Optical Components on Stem](/thumblibrary/U8474015/U8474015_01_140_140_Adjustable-Slit-on-Stem.jpg)
![Function Generator FG 100 (230 V, 50/60 Hz), 1009957 [U8533600-230], Function Generators](/thumblibrary/U8533600-230/U8533600-230_01_140_140_Function-Generator-FG-100-230-V-5060-Hz.jpg)
![Holder for Plug-in Components, 1018449 [U8557220], Stand Material: Clamp, Crocs and Accessory](/thumblibrary/U8557220/U8557220_01_140_140_Holder-for-Plug-in-Components.jpg)
![Analogue Multimeter ESCOLA 100, 1013527 [U8557380], Hand-held Analog Measuring Instruments](/thumblibrary/U8557380/U8557380_01_140_140_Analogue-Multimeter-ESCOLA-100.jpg)
![Spectrum Tube Chlorine, 1003406 [U41814], Spectrum Tubes and Spectrum Lamps](/thumblibrary/U41814/U41814_01_140_140_Spectrum-Tube-Chlorine.jpg)
![Vibration Generator, 1000701 [U56001], Oscillations](/thumblibrary/U56001/U56001_01_140_140_Vibration-Generator.jpg)
![Set of 10 Weights, 50 g, 1000771 [U8404720], Balance Weights](/thumblibrary/U8404720/U8404720_01_140_140_Set-of-10-Weights-50-g.jpg)