Photocell Meaning: Definition, Examples, and Translations
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photocell
[ˈfoʊ.təʊ.sɛl ]
Definition
electrical device
A photocell is a device that converts light energy into electrical energy. It is commonly used in outdoor lighting systems to automatically turn lights on at dusk and off at dawn based on ambient light levels.
Synonyms
light sensor, light-dependent resistor, photoresistor.
Examples of usage
- The street lights turn on automatically thanks to the photocell.
- A photocell helps conserve energy by only operating lights when necessary.
- Photocells are often used in solar garden lights for efficiency.
Translations
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Interesting Facts
Technology
- Photocells are widely used in streetlights to automatically turn them on at dusk and off at dawn.
- They are also used in solar panels to convert light energy into electricity, demonstrating their importance in renewable energy.
Science
- The principle behind photocells is based on the photoelectric effect, where light causes certain materials to emit electrons, leading to electricity.
- They can be made from different materials, with silicon being the most common due to its effectiveness and availability.
Applications
- Beyond lighting, photocells are used in cameras to adjust settings based on light conditions, improving photography.
- They can also be found in various home appliances, such as automatic garden lights that only activate in the dark.
Pop Culture
- Photocells have inspired plays and artworks, where themes of light and shadow symbolize knowledge and ignorance.
- In movies portraying futuristic settings, photocells are often part of advanced technology that automates everyday life.
Origin of 'photocell'
Main points about word origin
- The term comes from combining 'photo', meaning light in Greek, and 'cell', which refers to a basic unit or chamber.
- It was first introduced in the early 19th century, highlighting the growing fascination with light's properties and uses.
The term 'photocell' comes from the combination of 'photo' meaning 'light' and 'cell' referring to a basic unit of a system. The use of photocells dates back to the early 20th century when the technology for converting light into electrical energy was developed. Photocells utilize the photoelectric effect, a phenomenon that was first observed by Heinrich Hertz in the late 1800s. This principle was further explored by notable scientists like Albert Einstein, who explained how light could release electrons from materials. The practical applications of photocells have grown significantly since then, expanding from basic lighting to various fields including solar energy, security systems, and industrial automation.