Download - The Photocell
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The photocell
ANDREA JIMENEZDIAM 363288
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What is photocell?
• A photocell is any of a wide range of sensors that react based on the presence of light or electromagnetic energy. A photocell can be found to generate electricity, to photoresistors, which shift the photocell is one of the most important modern technological advancements, allowing for a whole range of new technologies to be created.
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WHO WAS THE INVENTOR OF THE PHOTOCELL?
The inventor of the first photocell was JULIUS ELSTER
And HANS F GEITEL
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WHERE WAS INVENTED THE PHOTOCELL?
The photocell was invented in Germany
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Characteristicsof the photocell
The photocell is Sensitive to the light
These device absorb the solar energy
These device Generate voltage owing to solar light
The photocell is used to act as a conductor.
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Types of
photocell
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• Photomultipler
Photomultipliers are extremely sensitive detectors. The faintest wave of light is multiplied by as much as 100 million times
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•Photovoltaic.
A photovoltaic cell converts solar energy into electrical power. Photons knock electrons on the cell itself into a higher state of energy, causing a usable current.
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• Photoresistor
Light-dependent resistors are devices whose resistivity to electrical currents decreases with the amount of light they're exposed to. Many alarms and camera light meters use cheap photoresistors for their applications
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ADVANGES AND DISADVANGES OF THE PHOTOCELL
ADVANGES• They generate free power
any where sunlight is avatible• No moving parts• They can be set up and left
alone for a while and can be engineered to withstand the rigours of a desert or of space.
DISADVANGES• They don’t work in the dark
or in low light conditions.• They take a long time to
recoup the initial investment • The photocell takes time to
set them up and for them to start working.
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HOW MUCH COST THE PHOTOCELL
•a photocell cost can vary from one dollar or more depending on use.
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Uses of the photocell
• A photocell can be used in any situation where beam of light falling on it is interrupted or broken by any mean.• To count vehicles passing a road.• To count items running on a conveyer belt.• To open doors automatically in a building such as
banks or other commercial buildings or offices.• To operate burglar alarms.• To produce sound in movies.
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thanks