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  2. Ionospheric dynamo region - Wikipedia

    en.wikipedia.org/wiki/Ionospheric_dynamo_region

    In the height region between about 85 and 200 km altitude on Earth, the ionospheric plasma is electrically conducting. Atmospheric tidal winds due to differential solar heating or due to gravitational lunar forcing move the ionospheric plasma against the geomagnetic field lines thus generating electric fields and currents just like a dynamo coil moving against magnetic field lines.

  3. IEC 61000-3-2 - Wikipedia

    en.wikipedia.org/wiki/IEC_61000-3-2

    IEC 61000-3-2 aims to set limits to the harmonic currents drawn by electrical apparatus and so maintain mains voltage quality. It is a compromise between cost and the performance of extra electronic front end circuits, the so called active power factor correcting circuits.

  4. Limit switch - Wikipedia

    en.wikipedia.org/wiki/Limit_switch

    A limit switch mounted on a moving part of a bridge. In electrical engineering, a limit switch is a switch operated by the motion of a machine part or the presence of an object. A limit switch can be used for controlling machinery as part of a control system, as a safety interlock, or as a counter enumerating objects passing a point. [1]

  5. Utilization categories - Wikipedia

    en.wikipedia.org/wiki/Utilization_categories

    The "Utilization category" are mainly categorized in IEC 60947 in the following volume: Volume 1: General requirements. Volume 2: Circuit-breakers. Volume 3: Circuit-breakers, circuit-breakers, switch-disconnectors and switch-fuse units. Volume 4-1: Contactors and motor starters; electromechanical contactors and motor starters [1]

  6. Current limiting - Wikipedia

    en.wikipedia.org/wiki/Current_limiting

    Current limiting is the practice of imposing a limit on the current that may be delivered to a load to protect the circuit generating or transmitting the current from harmful effects due to a short-circuit or overload. The term "current limiting" is also used to define a type of overcurrent protective device. According to the 2020 NEC/NFPA 70 ...

  7. Dynamo theory - Wikipedia

    en.wikipedia.org/wiki/Dynamo_theory

    The magnetic field of a magnetic dipole has an inverse cubic dependence in distance, so its order of magnitude at the earth surface can be approximated by multiplying the above result with (R outer core ⁄ R Earth) 3 = (2890 ⁄ 6370) 3 = 0.093 , giving 2.5×10 −5 Tesla, not far from the measured value of 3×10 −5 Tesla at the equator.

  8. AOL Mail

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    You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.

  9. Landauer's principle - Wikipedia

    en.wikipedia.org/wiki/Landauer's_principle

    Landauer's principle states that the minimum energy needed to erase one bit of information is proportional to the temperature at which the system is operating. Specifically, the energy needed for this computational task is given by. where is the Boltzmann constant and is the temperature in Kelvin. [2] At room temperature, the Landauer limit ...