Transformers

Card Set Information

Author:
Brownout
ID:
237015
Filename:
Transformers
Updated:
2013-09-26 14:35:09
Tags:
Trans
Folders:

Description:
Transformer Applications
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  1. Permeability
    The ability of a substance to be magnetized upon application of a magnetizing force

    u

    Wb/Atm
  2. Flux density
    The flux per unit area

    B

    T
  3. Flux
    the strength of a magnetic field represented by lines of force

    Φ

    Wb
  4. Magnetizing Force
    Magnetomotive force per unit length of a magnetic circuit

    H

    At/m
  5. Magnetomotive force
    The driving force in a magnetic circuit that establishes flux

    Fm

    At
  6. Reluctance
    A measurement of the opposition of a material to the establishment of the magnetic field

    Rm

    At/Wb
  7. Alternating current flowing in the primary of a transformer creates an alternating        , which establishes an alternating flux in the core.
    mmf
  8. The mmf is calculated as the              of the coil        and number of turns. The flux, according to            law is the           of the coil mmf to the reluctance of the core.
    • product
    • current
    • Weber’s
    • ratio
  9. According to          law, the alternating flux induces a voltage across the secondary winding. Secondary current flows when a load is connected across the secondary terminals.
    Faraday’s
  10. The load current, according to        law is calculated as the           of the induced voltage and the load              .
    • Ohm’s
    • ratio
    • impedance

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