PHOTORESISTANCE Meaning and
Definition
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Photoresistance, also known as a light-dependent resistor (LDR), is an electronic component that exhibits a change in its electrical resistance based on the intensity of incident light. It is a device widely used in various applications where light sensing is required. The resistance of a photoresistor decreases as the intensity of light incident on it increases, thereby altering its electrical behavior.
This light-sensitive component consists of a semiconductor material, typically made of cadmium sulfide (CdS) or other similar compounds, which possesses photoconductivity properties. The photoresistor functions based on the principle of the photovoltaic effect, which generates a flow of charge carriers (electrons and holes) under the influence of light. When exposed to light, photons excite the electrons in the semiconductor's valence band, allowing them to move into the conduction band, which leads to a decrease in resistance.
Photoresistors find applications in various forms of light detection and electronic control circuits. They are commonly used in automatic light control systems, such as streetlights or camera exposure control mechanisms, to adjust the brightness based on ambient conditions. They are also employed in devices like smoke detectors or burglar alarms to detect changes in light patterns caused by smoke or motion. Additionally, photoresistors are implemented in light meters, solar panels, and even as triggering elements in cameras to detect the presence of light and initiate necessary operations.
Overall, photoresistors provide a versatile and cost-effective solution for light sensing and light-dependent control in numerous electronic applications.
Common Misspellings for PHOTORESISTANCE
- ohotoresistance
- lhotoresistance
- 0hotoresistance
- pgotoresistance
- pbotoresistance
- pnotoresistance
- pjotoresistance
- puotoresistance
- pyotoresistance
- phitoresistance
- phktoresistance
- phltoresistance
- phptoresistance
- ph0toresistance
- ph9toresistance
- phororesistance
- phoforesistance
- phogoresistance
- phoyoresistance
- pho6oresistance
Etymology of PHOTORESISTANCE
The word "photoresistance" is a combination of two roots: "photo" and "resistance".
The root "photo" comes from the Greek word "phos" (φῶς), meaning "light". This root is commonly used in words related to light, such as "photograph", "photography", "photosynthesis", etc.
The other root, "resistance", comes from the Latin word "resistere", meaning "to withstand". In English, "resistance" refers to the act of opposing or withstanding something.
When combined, "photoresistance" refers to the quality or ability of withstanding or resisting the influence of light. In technical terms, it often refers to the electrical resistance of a material or device that changes in response to light exposure.
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