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2. Automobile auxiliary power outlet - Wikipedia

   en.wikipedia.org/wiki/Automobile_auxiliary_power...

   For the 12 volt systems, the center contact is the positive terminal and the shell is the negative terminal. Most automobiles connect the negative terminal to the frame of the vehicle (negative ground). 12 volt auto connectors are made to comply with a standard by Underwriters Laboratories for safety. UL2089 was developed to cover the ...

3. Switch - Wikipedia

   en.wikipedia.org/wiki/Switch

   A toggle switch or tumbler switch is a class of electrical switches that are manually actuated by a mechanical lever, handle, or rocking mechanism. Toggle switches are available in many different styles and sizes, and are used in numerous applications.

4. Multiway switching - Wikipedia

   en.wikipedia.org/wiki/Multiway_switching

   In building wiring, multiway switching is the interconnection of two or more electrical switches to control an electrical load from more than one location.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.

5. 12-volt outlet - Wikipedia

   en.wikipedia.org/wiki/12-volt_outlet

   A 12-volt outlet is any electrical outlet that outputs 12 volts and may refer to: Cigar lighter receptacle, the most famous example; Molex connector, used for connecting hard drives and optical drives, and sometimes for powering flash memory surrogate hard drive modules; Trailer lighting connector, has multiple prongs with 12 volts

6. Switched-mode power supply - Wikipedia

   en.wikipedia.org/wiki/Switched-mode_power_supply

   One of the two switches must be active (e.g., a transistor), while the other can be a diode. Sometimes, the topology can be changed simply by re-labeling the connections. A 12 V input, 5 V output buck converter can be converted to a 7 V input, −5 V output buck–boost by grounding the output and taking the output from the ground pin.

7. Electrical wiring in North America - Wikipedia

   en.wikipedia.org/wiki/Electrical_wiring_in_North...

   12/2 Non-metallic (NM) sheathed cable. Most circuits in the modern North American home and light commercial construction are wired with non-metallic sheathed (NM) cable designated type. [9] This type of cable is the least expensive for a given size and is appropriate for dry indoor applications.