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  2. Extension cord - Wikipedia

    en.wikipedia.org/wiki/Extension_cord

    Yellow NEMA 5-15 extension cord NEMA-1 extension cord, common in the United States Extension cord reel (Germany). An extension cord (US), extension cable, power extender, drop cord, or extension lead (UK) is a length of flexible electrical power cable (flex) with a plug on one end and one or more sockets on the other end (usually of the same type as the plug).

  3. Open-loop controller - Wikipedia

    en.wikipedia.org/wiki/Open-loop_controller

    In control theory, an open-loop controller, also called a non-feedback controller, is a control loop part of a control system in which the control action ("input" to the system [1]) is independent of the "process output", which is the process variable that is being controlled. [2]

  4. Power strip - Wikipedia

    en.wikipedia.org/wiki/Power_strip

    1.1 These requirements cover cord-connected, relocatable power taps rated 250 V AC or less and 20 A AC or less. A relocatable power tap is intended only for indoor use as a temporary extension of a grounding alternating-current branch circuit for general use. National Electrical Code recognizes power strip as Multioutlet Assembly in Article 380.

  5. Loop antenna - Wikipedia

    en.wikipedia.org/wiki/Loop_antenna

    A loop antenna is a radio antenna consisting of a loop or coil of wire, tubing, or other electrical conductor, that for transmitting is usually fed by a balanced power source or for receiving feeds a balanced load. Within this physical description there are two (possibly three) distinct types:

  6. Electromagnetic coil - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_coil

    A coil with a core which is a straight bar or other non-loop shape is called an open-core coil. This has lower magnetic field and inductance than a closed core, but is often used to prevent magnetic saturation of the core. A coil without a ferromagnetic core is called an air-core coil. [14]

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