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  2. Light switch - Wikipedia

    en.wikipedia.org/wiki/Light_switch

    In electrical wiring, a light switch is a switch most commonly used to operate electric lights, permanently connected equipment, or electrical outlets. Portable lamps such as table lamps may have a light switch mounted on the socket, base, or in-line with the cord.

  3. Float (liquid level) - Wikipedia

    en.wikipedia.org/wiki/Float_(liquid_level)

    A float ball (in orange color) Liquid level floats, also known as float balls, are spherical, cylindrical, oblong or similarly shaped objects, made from either rigid or flexible material, that are buoyant in water and other liquids.

  4. Photochromism - Wikipedia

    en.wikipedia.org/wiki/Photochromism

    Photochromism is the reversible change of color upon exposure to light. It is a transformation of a chemical species ( photoswitch ) between two forms by the absorption of electromagnetic radiation ( photoisomerization ), where the two forms have different absorption spectra.

  5. Switch - Wikipedia

    en.wikipedia.org/wiki/Switch

    A switch may be directly manipulated by a human as a control signal to a system, such as a computer keyboard button, or to control power flow in a circuit, such as a light switch. Automatically operated switches can be used to control the motions of machines, for example, to indicate that a garage door has reached its full open position or that ...

  6. Electronic switch - Wikipedia

    en.wikipedia.org/wiki/Electronic_switch

    The traditional relay is an electromechanical switch that uses an electromagnet controlled by a current to operate a mechanical switching mechanism. Other operating principles are also used (for instance, solid-state relays invented in 1971 control power circuits with no moving parts, instead using a semiconductor device to perform switching ...

  7. Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.

  8. Alabama's College Football Playoff ranking illustrates ...

    www.aol.com/alabamas-college-football-playoff...

    Alabama looks in line for a College Football Playoff berth and that's a nod to the power of the SEC and Big Ten compared to other conferences.

  9. Optical transistor - Wikipedia

    en.wikipedia.org/wiki/Optical_transistor

    An optical transistor, also known as an optical switch or a light valve, is a device that switches or amplifies optical signals.Light occurring on an optical transistor's input changes the intensity of light emitted from the transistor's output while output power is supplied by an additional optical source.

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