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Photoelectric cell

 * Construction
 * Working
 * Applications

Construction
It works on the principle of photoelectric effect. It consists of a semi cylindrical photosensitive metal plate C (emitter) which acts a cathode and a wire loop A (collector which acts as anode. The above arrangement is supported in am evacuated glass or quartz bulb. It is connected to the external circuit having a high tension battery and a (μΑ).

Working
These are attracted towards the collector A. A small photoelectric current is produced. This current is recorded by the connected in the circuit. If the intensity of incident radiation is increased the rate of photoelectric emission increases causing an increase in the current. Thus current is directly proportional to the intensity of incident radiation.



Applications of photoelectric cell
It consists of a photoelectric cell, a battery and a joined in series. When it is directed towards the object to be photographed the light enters the photoelectric cell and sets up a current in the circuit. The extent of deflection of the pointer in the is directly proportional to the intensity of light.Generally the is calibrated to give the exposure time directly.

2. ===== Burglar alarm =====: In this application, a photoelectric cell is used to activate relay mechanism. The light from an infrared lamp falls on the photosensitive surface of photoelectric cell. The infrared beam is invisible and when some one crossed the beam, the light is cut-off and photoelectric current stops. This operates the relay circuit and starts ringing the bell.

3. ===== Sound reproduction from motion pictures ===== : Light from a powerful lamp passes through the sound track at the edge of the film and falls on the photosensitive surface of photoelectric cell. The photoelectric current varies according to the intensity of light transmitted by the recorded sound track. The varying current is amplified and fed to the loudspeaker. The loudspeaker reproduces the sound recorded on the sound track.

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Photoelectric cell

 * Construction
 * Working
 * Applications

Construction
It works on the principle of photoelectric effect. It consists of a semi cylindrical photosensitive metal plate C (emitter) which acts a cathode and a wire loop A (collector which acts as anode. The above arrangement is supported in am evacuated glass or quartz bulb. It is connected to the external circuit having a high tension battery and a (μΑ).

Working
These are attracted towards the collector A. A small photoelectric current is produced. This current is recorded by the connected in the circuit. If the intensity of incident radiation is increased the rate of photoelectric emission increases causing an increase in the current. Thus current is directly proportional to the intensity of incident radiation.



Applications of photoelectric cell
It consists of a photoelectric cell, a battery and a joined in series. When it is directed towards the object to be photographed the light enters the photoelectric cell and sets up a current in the circuit. The extent of deflection of the pointer in the is directly proportional to the intensity of light.Generally the is calibrated to give the exposure time directly.

2. ===== Burglar alarm =====: In this application, a photoelectric cell is used to activate relay mechanism. The light from an infrared lamp falls on the photosensitive surface of photoelectric cell. The infrared beam is invisible and when some one crossed the beam, the light is cut-off and photoelectric current stops. This operates the relay circuit and starts ringing the bell.

3. ===== Sound reproduction from motion pictures ===== : Light from a powerful lamp passes through the sound track at the edge of the film and falls on the photosensitive surface of photoelectric cell. The photoelectric current varies according to the intensity of light transmitted by the recorded sound track. The varying current is amplified and fed to the loudspeaker. The loudspeaker reproduces the sound recorded on the sound track.

Request review at WP:AFC
<!--Please don't change anything and press save

Photoelectric cell

 * Construction
 * Working
 * Applications

Construction
It works on the principle of photoelectric effect. It consists of a semi cylindrical photosensitive metal plate C (emitter) which acts a cathode and a wire loop A (collector which acts as anode. The above arrangement is supported in am evacuated glass or quartz bulb. It is connected to the external circuit having a high tension battery and a (μΑ).

Working
These are attracted towards the collector A. A small photoelectric current is produced. This current is recorded by the connected in the circuit. If the intensity of incident radiation is increased the rate of photoelectric emission increases causing an increase in the current. Thus current is directly proportional to the intensity of incident radiation.



Applications of photoelectric cell
It consists of a photoelectric cell, a battery and a joined in series. When it is directed towards the object to be photographed the light enters the photoelectric cell and sets up a current in the circuit. The extent of deflection of the pointer in the is directly proportional to the intensity of light.Generally the is calibrated to give the exposure time directly.

2. ===== Burglar alarm =====: In this application, a photoelectric cell is used to activate relay mechanism. The light from an infrared lamp falls on the photosensitive surface of photoelectric cell. The infrared beam is invisible and when some one crossed the beam, the light is cut-off and photoelectric current stops. This operates the relay circuit and starts ringing the bell.

3. ===== Sound reproduction from motion pictures ===== : Light from a powerful lamp passes through the sound track at the edge of the film and falls on the photosensitive surface of photoelectric cell. The photoelectric current varies according to the intensity of light transmitted by the recorded sound track. The varying current is amplified and fed to the loudspeaker. The loudspeaker reproduces the sound recorded on the sound track.