What is a Photoelectric Cell?
(Photo means Light ) A photoelectric cell is a device
which converts light energy into electrical energy. It works on the principle
of photoelectric effect((The emission of electrons by
certain substances [[[[[[[[(metals) when they are exposed to
radiation of suitable frequencies is called Ph]otoelectric Effect[][). It consist of semicylendrical photosensensetive
metal plate (collector) and a wire loop. A loop supported in an evacuated glass
or quartz bulb. It is connected in external circuit having a high tension
battery and a microammeter (µA).
The advantage of Photoelectric cell:-
· It is used in an exposure meter with camera to determine the correct time of exposure for having photograph
· A photoelectric cell is used to activate relay mechanism.
· It used for sound reproduction from motion picture.
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