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2. Edison screw - Wikipedia

   en.wikipedia.org/wiki/Edison_screw

   Some adapters for wall outlets use an Edison screw, allowing a light socket to become an ungrounded electrical outlet (such as to install Christmas lights temporarily via a porch light), or to make a pull-chain switch with two outlets, or to split it for two lamps. Another adapter can make a wall outlet into a lamp holder (lamp socket).

3. Knob-and-tube wiring - Wikipedia

   en.wikipedia.org/wiki/Knob-and-tube_wiring

   When a generic power outlet was desired, the wiring could run directly into the junction box through a tube of protective loom and a ceramic bushing. Wiring devices such as light switches, receptacle outlets, and lamp sockets were either surface-mounted, suspended, or flush-mounted within walls and ceilings.

4. Light switch - Wikipedia

   en.wikipedia.org/wiki/Light_switch

   A switch of basically the same design is also used on Australian power outlet wall-plates. It is now extremely rare to find any other type of switch in Australian homes, although the Australian Wiring Standard AS 3112 does not forbid other types. While many variations of Australian designs and cover plates are available, some designers and ...

5. Lightbulb socket - Wikipedia

   en.wikipedia.org/wiki/Lightbulb_socket

   A wedge base holds the lamp by spring compression in the socket. The lamp is inserted and removed without twisting. Wedge base lamps are widely used in automotive applications, and many Christmas lights strings use plastic wedge-based bulbs. Other wedge bases include strip lamps, sometimes called architectural lamps, with S14s connections ...

6. Light fixture - Wikipedia

   en.wikipedia.org/wiki/Light_fixture

   Movable lamps have a plug and cord that plugs into a wall socket. Light fixtures may also have other features, such as reflectors for directing the light, an aperture (with or without a lens ), an outer shell or housing for lamp alignment and protection, an electrical ballast or power supply , and a shade to diffuse the light or direct it ...

7. Multiway switching - Wikipedia

   en.wikipedia.org/wiki/Multiway_switching

   A common application is in lighting, where it allows the control of lamps from multiple locations, for example in a hallway, stairwell, or large room. In contrast to a simple light switch , which is a single pole, single throw (SPST) switch, multiway switching uses switches with one or more additional contacts and two or more wires are run ...