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resistor help

Discussion in 'Electronic Basics' started by jack, Oct 2, 2003.

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  1. jack

    jack Guest

    I've been trying to locate a specific resistor without any luck so
    far,I'm wondering if any one has any leads on this. I'm looking for a
    1 ohm , 1% tolerance, non inductive 10 watt or higher resistor.Most
    of the websites have 1 or 2 of the requirements but not all. Any help?
    thanks ahead. jk
  2. Terry

    Terry Guest

    You could probably make one?
    For example standard 22AWG copper wire has a resistance of about
    10.39 ohms per 1000 feet.
    So 96 feet of that wound on something suitable such a ceramic
    former (40 to 50 turns on a six inch form?) etc. would do?
    Also if you have access to a Wheatstone bridge and a good quality
    resistance standard you should be able to adjust the actual
    resistance very closely to less than 1% by adjusting the end
    connection or even adding/removing a turn/s?
    Other alternative are thinner wire or two such 'home-made'
    resistors in parallel (Does size/appearance matter?) Also how
    many such resistors do you need; only one? Or for a production
    run of hundreds?
    Or you could use resistance wire from an electric heater? After
    all a 1500 watt, 115 volt heater has an approximate resistance of
    9 ohms!
    However wire resistors may not meet your 'non inductive'
    requirement, even if wound counter inductively? At what frequency
    will it be operating? Or will inductive switching surges be
    Ideas anyway?
    PS. If space and reliability are limitations/requireemnts such as
    in a space rocket the type of resistor could be very different to
    something for a laboratory experiment. Also the
    thermal/resitivity coefficient might be a factor since it will be
    dissipating ten watts or more?
  3. John Fields

    John Fields Guest

  4. Baphomet

    Baphomet Guest

  5. David Harmon

    David Harmon Guest

    But when recommending this please make sure to explain how to make
    96 feet of wire wound on a former be non-inductive!
  6. John Fields

    John Fields Guest

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