Photoconductivity

PHOTOCONDUCTIVITY SK007

Exp-1 To study the current vs voltage characteristics of CdS photo-resistor at constant irradiance.
Exp-2 To measure the photo-current as a function of the irradiance at constant voltage.

Multipurpose power supply.
Electrical safety tested.
Adjustable slit self centering.
Marked analyzer & polarizer for angle measurement.

Photo resistor.
Photo current.
Irradiance.

Principle and Working:
Absorption of light increases electrical conductivity in a solid. In case of cadmium sulphide (CdS) photoresistor, when it is exposed to light the transition of activator electrons into the conduction band and charge exchange of traps with holes being created in the valence band causing enhancement of conductivity.
In the present setup, photo current is studied as a function of the voltage applied to the photo resistor at a constant irradiance. The angle of polarization is changed by polarizer filter.

Contents:

Cat. No.	Item Name	Qty.
SL804	Photoresistor in holder (CdS)	1
SE080	Power supply 12V AC/DC 5 Amp.	1
SL803	Lamp housing	1
SL754	Convex lens in holder	1
SL801	Polarizer/Analyzer (pair)	1
SL214	Optical bench	1
SL802	Adjustable slit self centering	1
SE079	Reg. power supply, 0-16V DC, 5A	1
SE067	Digital multimeter	1
SN203	Flexible plug lead, 50 cm (Red)	2
SN201	Flexible plug lead, 1m (Black)	1
SL216	Shaddle	1
SL436	Transversal saddle	1

Power Supply 0-16V, 5A SE079
- SPECIFICATIONS Voltage : 0-16 Volt DC continuously variable & stabilized
  Ripple : Less than 25mV
  Overload protection : Current limiting
  Current : 5 Amp. continuously variable from 10% to full rating
  Display : Two separate displays(3 digit LED) are provided to monitor the output voltage and load current continuously
  Working voltage : 230V AC, 50 Hz single phase
Power Supply 12V AC/DC SE080
- SPECIFICATIONS Output : 2,3,4,5,6,8,10 & 12VAC full wave rectified, unsmoothed & unregulated D.C.
  Overload : Resettable thermal trip.
  Input : 230 V AC,50 Hz
Optical Bench SL214
- SPECIFICATIONS Material : Aluminium alloy
  Type : Hexagonal section
  Scale : 0-100cm
  Least count : 1mm
Polarizer / Analyzer SL801
- SPECIFICATIONS Angle : Adjustable (0°-90°)
  Aperture : 21mm dia.
  Frame : 130mm dia., to avoids scattering of lights
  Rod : 10 mm dia.
Lamp Housing SL803
- SPECIFICATIONS Lamp : 12V, 21V
  Lens : Spherical condenser, to and for adjustment
  Connection : 4mm plug lead
  Mounting rod : 10mm dia.
  Housing : Aluminium, Heat ventilation arrangement
Convex Lens in Holder SL754
- SPECIFICATIONS Focal Length : 100mm
  Diameter of Lens : 50 mm
  Frame Diameter : 130 mm to avoids scattering of lights
  Rod Diameter : 10 mm
Digital Multimeter SE067
- SPECIFICATIONS Resistance : 200W, 2000W, 20k, 200k & 2000k W.
  D.C.Voltage : 200 & 2000 mV
  : 20, 200 & 600 V
  A.C.Voltage : 200 & 600 V
  D.C.Current : 200 & 2000 mA
  : 20 & 200 mA
  : 10 A
  Testing : Diode & transistor
  Battery : 9V
Photo Resistor LDR in Mount SL804
- SPECIFICATIONS Photo resistor : CdS ( Cadmium sulphide)
  Aperture : 10mm, Clear
  Mounting rod : 10mm dia.
  Connection : 4mm safety terminals
  Working voltage : 0-16V DC
Adjustable Slit Self Centring SL802
- SPECIFICATIONS Slit Width : 0-2 mm
  Height : 6 mm
  Frame Diameter : 120 mm to avoids scattering of lights
  Mounting rod : 10mm dia.

PHOTOCONDUCTIVITY SK007

Light & Optics Experiments

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