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- Photoresistor abstract "A photoresistor or light-dependent resistor (LDR) or photocell is a light-controlled variable resistor. The resistance of a photoresistor decreases with increasing incident light intensity; in other words, it exhibits photoconductivity. A photoresistor can be applied in light-sensitive detector circuits, and light- and dark-activated switching circuits. A photoresistor is made of a high resistance semiconductor. In the dark, a photoresistor can have a resistance as high as a few megaohms (MΩ), while in the light, a photoresistor can have a resistance as low as a few hundred ohms. If incident light on a photoresistor exceeds a certain frequency, photons absorbed by the semiconductor give bound electrons enough energy to jump into the conduction band. The resulting free electrons (and their hole partners) conduct electricity, thereby lowering resistance. The resistance range and sensitivity of a photoresistor can substantially differ among dissimilar devices. Moreover, unique photoresistors may react substantially differently to photons within certain wavelength bands.A photoelectric device can be either intrinsic or extrinsic. An intrinsic semiconductor has its own charge carriers and is not an efficient semiconductor, for example, silicon. In intrinsic devices the only available electrons are in the valence band, and hence the photon must have enough energy to excite the electron across the entire bandgap. Extrinsic devices have impurities, also called dopants, added whose ground state energy is closer to the conduction band; since the electrons do not have as far to jump, lower energy photons (that is, longer wavelengths and lower frequencies) are sufficient to trigger the device. If a sample of silicon has some of its atoms replaced by phosphorus atoms (impurities), there will be extra electrons available for conduction. This is an example of an extrinsic semiconductor.".
- Photoresistor thumbnail Photoresistor.svg?width=300.
- Photoresistor wikiPageExternalLink MoonLight.html.
- Photoresistor wikiPageExternalLink photoresistor.html.
- Photoresistor wikiPageExternalLink light_dependent_resistor.php.
- Photoresistor wikiPageExternalLink lab7.
- Photoresistor wikiPageID "102789".
- Photoresistor wikiPageRevisionID "602522255".
- Photoresistor hasPhotoCollection Photoresistor.
- Photoresistor subject Category:Optical_devices.
- Photoresistor subject Category:Resistive_components.
- Photoresistor subject Category:Sensors.
- Photoresistor type Artifact100021939.
- Photoresistor type Detector103180969.
- Photoresistor type Device103183080.
- Photoresistor type Instrumentality103575240.
- Photoresistor type Object100002684.
- Photoresistor type OpticalDevice103851341.
- Photoresistor type OpticalDevices.
- Photoresistor type PhysicalEntity100001930.
- Photoresistor type Sensors.
- Photoresistor type Whole100003553.
- Photoresistor comment "A photoresistor or light-dependent resistor (LDR) or photocell is a light-controlled variable resistor. The resistance of a photoresistor decreases with increasing incident light intensity; in other words, it exhibits photoconductivity. A photoresistor can be applied in light-sensitive detector circuits, and light- and dark-activated switching circuits. A photoresistor is made of a high resistance semiconductor.".
- Photoresistor label "Fotoresistenza".
- Photoresistor label "Fotorezystor".
- Photoresistor label "Fotorresistencia".
- Photoresistor label "Fotowiderstand".
- Photoresistor label "LDR".
- Photoresistor label "Lichtgevoelige weerstand".
- Photoresistor label "Photoresistor".
- Photoresistor label "Photorésistance".
- Photoresistor label "Фоторезистор".
- Photoresistor label "مقاومة ضوئية".
- Photoresistor label "フォトレジスタ".
- Photoresistor label "光敏电阻".
- Photoresistor sameAs Fotorezistor.
- Photoresistor sameAs Fotowiderstand.
- Photoresistor sameAs Fotorresistencia.
- Photoresistor sameAs Photorésistance.
- Photoresistor sameAs Resistor_foto.
- Photoresistor sameAs Fotoresistenza.
- Photoresistor sameAs フォトレジスタ.
- Photoresistor sameAs Lichtgevoelige_weerstand.
- Photoresistor sameAs Fotorezystor.
- Photoresistor sameAs LDR.
- Photoresistor sameAs m.0pznc.
- Photoresistor sameAs Q194120.
- Photoresistor sameAs Q194120.
- Photoresistor sameAs Photoresistor.
- Photoresistor wasDerivedFrom Photoresistor?oldid=602522255.
- Photoresistor depiction Photoresistor.svg.
- Photoresistor isPrimaryTopicOf Photoresistor.
