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How do Toroids work, and What are they used for?

  1. May 9, 2009 #1
    How do Toroids (inductors) work, and What are they used for (in electronics and/or other physics applications)?

    Last edited: May 9, 2009
  2. jcsd
  3. May 9, 2009 #2
    They're used for lots of things: washers, bangles, rings on fingers; it's just a shape, like 'square' is.
  4. May 9, 2009 #3
    Are you thinking of toroidal magnets?
  5. May 9, 2009 #4
    Sorry for not specifying, but I meant Toroids as in the electricity and magnetism part of physics, such as an inductor or a "round solenoid."

  6. May 9, 2009 #5
    A toroidal ferrite core with wire wound on it is called a choke in EE.
    Try wikipedia (and an old PC power supply); do you understand induction?
  7. May 9, 2009 #6
    I understand induction, but I can't think of any real-life applications of when a toroid would be useful.
  8. May 9, 2009 #7
    Hmm, well, choke coils are fairly ubiquitous, see what a choke does and see if it looks useful.
  9. May 9, 2009 #8


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    An inductor blocks transmission of a fast changing signal such as external interference on a wire.
    They are normally only called chokes when they are inductors in circuit.
  10. May 9, 2009 #9
    It depends on the application, and frequency domain where the material can be powdered iron, or wound soft steel tape, or ferrite.

    In small, bead form, on a wire, torroids block noise. Toroidal cores are even used in 60Hz transformers where a low profile is a requirement. Current transformers, antenna balums, and line filters are some uses. Way back when, square BH core material toroids were used to store data bits (core memory).

    Packaged with a couple capacitors, or used discretely, they are commonly used as line filters.
    Last edited: May 10, 2009
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