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Photocell consists of two special pieces of silicon joined together. Pure silicon is neaturally charged but if small amount of an impurity such as phosphurus is added, ther are more free electron which make this a better conductor than pure silicon. This is known as n-type(negative) silicon. If a diffrent impurity, such as boron, is added there is an absence of free elactron. The absence of an elactron is known as a hole and the silicon is knpwn as p-type silicon. When these two types of silicon are placed together it is called a p-n junction. An electric field is created between the two layers. Sunlight is made up of a tiny packets of energy called photons. When photons are absorbed the energy causes electron to become free. They move to the negetive layer and leave the junction to flow in an external curcuit.
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∙ 15y ago
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∙ 13y agoIn a photovoltaic cell, light is used to produce voltage. In a photoconductive cell, light is used to regulate the flow of current. Photocells are used in control systems, where interrupting a beam of light opens a circuit, actuating a relay that supplies power to a mechanism to bring about a desired operation, such as opening a door or setting off a burglar alarm. Photocells are also used in photometry and spectroscopy.
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∙ 13y agophotoreceptors, which are responsible for detecting light and, therefore, enable us to see. These photoreceptors are arranged in certain ways to help us recognize different objects. Some photoreceptors are activated (and thereby sends signals to the brain) when they detect light, while others are activated when they do not detect light. The more light (or darkness) each cell detects, the more active they become.
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∙ 12y agophoto cell convert light energy into electric power
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∙ 12y agoThere is a lot of things when you talked about photocell... well in electronics world of terms the main functions of photocell are for sensing which provides limits or safety.
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∙ 11y agolight is an electromagnetic wave with a very high frequency
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∙ 10y agonly rele
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How do you replace a photocell on your outdoor light post?
# Turn off the power to the lamppost circuit at the breaker box. # Unscrew the mounting screws holding the lamp in place, and pull the lamp fixture from the post. Remove the wire nuts, and use the circuit tester to be sure the power is off. # Disconnect the wires to the fixture and the photocell. # Disconnect the locking nuts that hold the existing photocell on the post, and remove the photocell. If your lamp doesn't have a photocell, you'll need to drill an access hole in the post to install one. # Install the adhesive foam ring (provided with the photocell) around the mounting hole. # Run a bead of silicone sealant around the photocell where it will press against the interior of the lamppost. # Push the sensor through the mounting hole, and secure it with a locking nut. # Add silicone sealant inside the lamp fixture at any point where moisture might leak through to the photocell. # Connect the white wires from the power supply, lamp, and photocell together. Secure the connection with a wire nut. Connect the black photocell wire to the black power supply wire in the same manner. Connect the black lamp fixture wire to the red photocell wire and secure the connection with a wire nut. # Reainstall the fixture on the lamppost.
Can you wire a photocell to work at night instead of during the day?
Photocells are designed to work at night when it gets dark and turn off in the morning when it gets lighter. If the photocell is on during the day then it is not working the way it was designed to. Time to get a new one.
In a photocell what is the charge of a hole?
The charge of a "hole" is positive (+ive), it is the lack of an electron (negative/-ive) to make the atom "neutral".
What is the tranducer used in a smoke detector?
There are two types:ionization - a tiny piece of Americium ionizes air in the transducer. a tiny electric current passes through this ionized air. smoke deionizes this air, reducing the current and tripping the alarm.photoelectric - a light and photocell in the transducer looks for smoke. smoke reduces the light falling on the photocell, tripping the alarm.
4 advantages of photocells?
Photocell are able tostore energy for long periods of timework in remote areasare cheaper than fuel in the long rungreen solution for renewable energy
Where do you buy a 6 volt replacement photocell?
You can buy 6v photocell dusk to dawn switches from Acetek photocells
How does a photocell convert light into electrical energy?
Light heats a photocell, and the difference in temperature creates an electric current(:
How does a roof affect the position of a photocell?
the roof is slanted so you will need to put your photocell on the side of the roof where the sun is shining
Is photocell used in calculator?
Yes
What does photocell mean?
light of a cell
When light strikes a photocell does the resistance increase or decrease?
When light strikes a photocell, the resistance decreases, allowing current to flow more freely.
What chemical element is used in a photocell?
Silicon
How do you replace a photocell on your outdoor light post?
# Turn off the power to the lamppost circuit at the breaker box. # Unscrew the mounting screws holding the lamp in place, and pull the lamp fixture from the post. Remove the wire nuts, and use the circuit tester to be sure the power is off. # Disconnect the wires to the fixture and the photocell. # Disconnect the locking nuts that hold the existing photocell on the post, and remove the photocell. If your lamp doesn't have a photocell, you'll need to drill an access hole in the post to install one. # Install the adhesive foam ring (provided with the photocell) around the mounting hole. # Run a bead of silicone sealant around the photocell where it will press against the interior of the lamppost. # Push the sensor through the mounting hole, and secure it with a locking nut. # Add silicone sealant inside the lamp fixture at any point where moisture might leak through to the photocell. # Connect the white wires from the power supply, lamp, and photocell together. Secure the connection with a wire nut. Connect the black photocell wire to the black power supply wire in the same manner. Connect the black lamp fixture wire to the red photocell wire and secure the connection with a wire nut. # Reainstall the fixture on the lamppost.
Where can someone get professional photocell lighting?
Professional photocell lighting is available from a number of websites. Some of the most popular include Arcadian Homes, Build and Lighting Showplace.
Why would lights come on by themselves?
Perhaps they are on a timer or photocell.
Do led floodlights work with a photocell?
A: Photocell and LED cannot work directly because these are different devices. But yes each independently can work as a unit all you need is some buffering.
What changes chemical or radiant energy into electrical energy?
I might be wrong on this one, but I believe it is either a cell or a photocell. A cell would be correct, a photocell converts light energy into electrical energy.
