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.
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.
|Cat. No.||Item Name||Qty.|
|SL804||Photoresistor in holder (CdS)||1|
|SE080||Power supply 12V AC/DC 5 Amp.||1|
|SL754||Convex lens in holder||1|
|SL802||Adjustable slit self centering||1|
|SE079||Reg. power supply, 0-16V DC, 5A||1|
|SN203||Flexible plug lead, 50 cm (Red)||2|
|SN201||Flexible plug lead, 1m (Black)||1|