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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. Dimmer - Wikipedia

    en.wikipedia.org/wiki/Dimmer

    This small device allowed the dimmer to be installed in a standard electrical wall box while saving energy. [2] [3] In 1966, Eugene Alessio patented a light bulb socket adapter for adjusting a light level on a single light bulb using a triac. To house this device, he decided on a 2-inch round device with one end capable of being screwed into a ...

  4. Trailer connectors in North America - Wikipedia

    en.wikipedia.org/wiki/Trailer_connectors_in...

    +12 V via ignition lock: Black: 10: 8: 3 L54: Left Turn Signal, Stop lamps: Yellow: 4: 12: 4 Reversing lamps, control current to block surge brakes when reversing. Red or Purple: 6: 10: 5 R54: Right Turn Signal, Stop lamps: Green: 4: 12: 6 58: Tail lamps, clearance lamps/outline marker lamps and registration plate lamp: Brown: 4: 12: 7 Electric ...

  5. Glossary of military abbreviations - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_military...

    A A&TWF – Acquisition and technology work force a – Army AA – Assembly area AA – Anti-aircraft AA – Aegis ashore AAA – Anti-aircraft artillery "Triple A" AAAV – Advanced Amphibious Assault Vehicle AAC – Army Air Corps AAD – Armored amphibious dozer AADC – Area air defense commander AAE – Army acquisition executive AAG – Anti-aircraft gun AAK – Appliqué armor kit (US ...

  6. Railroad switch - Wikipedia

    en.wikipedia.org/wiki/Railroad_switch

    A right-hand railroad switch with point indicator pointing to right Animated diagram of a right-hand railroad switch. Rail track A divides into two: track B (the straight track) and track C (the diverging track); note that the green line represents direction of travel only, the black lines represent fixed portions of track, and the red lines depict the moving components.