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Charge a battery through a nonconductive material?

Discussion in 'Electronic Basics' started by John Doe, Sep 17, 2005.

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  1. John Doe

    John Doe Guest

    I just added another low end electric toothbrush (Oral-B PowerMax) to
    my collection.

    It is rechargeable. As far as I can tell there are no metal contacts
    on the outside of the toothbrush casing where it slips into the
    charger, but it does charge.

    Is it charging through a conductive surface that looks like plastic,
    or is there some (practical) way to charge a battery through
    nonconductive material?

    Mainly curious.
     
  2. They use inductive coupling, ie 2 coils.
     
  3. JazzMan

    JazzMan Guest

    The charging base and the bottom of the toothbrush are two
    halves of a transformer that pass A/C current.

    JazzMan
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  4. John Doe

    John Doe Guest

    Cool.

    Thanks to the replies.
     
  5. Jasen Betts

    Jasen Betts Guest

    It's called induction it's the principle upon which transformers work,
    while plastic won't pass electric curren it'll pass magnetic fields just
    fine.

    Bye.
    Jasen
     
  6. Jasen Betts

    Jasen Betts Guest

    It's called induction it's the principle upon which transformers work,
    while plastic won't pass electric curren it'll pass magnetic fields
    just
    fine.

    Bye.
    Jasen
     
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