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  2. Template:Amazon Fire TV Models - Wikipedia

    en.wikipedia.org/wiki/Template:Amazon_Fire_TV_Models

    Model name AFTB AFTM AFTS AFTT AFTN AFTA AFTMM AFTR AFTSSS/AFTSS AFTKA AFTGAZL AFTKM AFTKRT Model No. [6] CL1130 W87CUN DV83YW LY73PR LDC9WZ EX69VW E9L29Y A78V3N S3L46N K2R2TE GA5Z9L M3N6RA K3R6AT Release date April 12, 2014: November 19, 2014 September 29, 2015: October 20, 2016 October 25, 2017 June 21, 2018 October 31, 2018 October 10, 2019

  3. Earth inductor compass - Wikipedia

    en.wikipedia.org/wiki/Earth_inductor_compass

    The anemometer of the earth inductor compass on the Spirit of St. Louis shows as a small "T" shape above the fuselage behind the wing. The Earth inductor compass (or simply induction compass [1]) is a compass that determines directions using the principle of electromagnetic induction, with the Earth's magnetic field acting as the induction field for an electric generator. [2]

  4. Magnetic field - Wikipedia

    en.wikipedia.org/wiki/Magnetic_field

    The magnetic field of larger magnets can be obtained by modeling them as a collection of a large number of small magnets called dipoles each having their own m. The magnetic field produced by the magnet then is the net magnetic field of these dipoles; any net force on the magnet is a result of adding up the forces on the individual dipoles.

  5. Magnetometer - Wikipedia

    en.wikipedia.org/wiki/Magnetometer

    The Earth's magnetic field can vary from 20,000 to 80,000 nT depending on location, fluctuations in the Earth's magnetic field are on the order of 100 nT, and magnetic field variations due to magnetic anomalies can be in the picotesla (pT) range. [3] Gaussmeters and teslameters are magnetometers that measure in units of gauss or tesla ...

  6. List of measuring instruments - Wikipedia

    en.wikipedia.org/wiki/List_of_measuring_instruments

    That field is called electric field.If the charge doesn't move. If the charge moves, thus realizing an electric current, especially in an electrically neutral conductor, that field is called magnetic. Electricity can be given a quality — a potential. And electricity has a substance-like property, the electric charge.

  7. Inductive sensor - Wikipedia

    en.wikipedia.org/wiki/Inductive_sensor

    by assuming that the induced magnetic field B is homogeneous over a section S (the magnetic flux will be expressed =). One form of inductive sensor drives a coil with an oscillator . A metallic object approaching the coil will alter the inductance of the coil, producing a change in frequency or a change in the current in the coil.

  8. Automatic Warning System - Wikipedia

    en.wikipedia.org/wiki/Automatic_Warning_System

    The train detects the polarity of magnetic field via an AWS receiver, permanently mounted under the train. [1] An AWS magnet is made up of 1 permanent magnet, and an optional electromagnet. The permanent magnet is generally uncontrollable, and always produces a constant magnetic field of unchanging polarity.

  9. EMF measurement - Wikipedia

    en.wikipedia.org/wiki/EMF_measurement

    E-field projections on an orthogonal reference frame. Measurements of the EMF are obtained using an E-field sensor or H-field sensor which can be isotropic or mono-axial, active or passive. A mono-axial, omnidirectional probe is a device which senses the Electric (short dipole) or Magnetic field linearly polarized in a given direction.