Term - Photo electric cell
|Photo electric cell||SWPP and BPPA Photographic Glossary|
Wednesday 17th December 2014
Photo electric cell
The light sensitive cell. Two types are used in exposure meters. A selenium cell generates electricity in proportion to the amount of light falling upon its surface. A cadmium sulfide cell offers a resistance to a small electric charge when light falls upon it. Cadmium sulfide cells are more sensitive then selenium, especially at low light levels.
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