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loading a circuit — Parallax Forums

loading a circuit

mctriviamctrivia Posts: 3,772
edited 2009-10-03 18:45 in General Discussion
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On a 120v circuit I would like to be able to put a 30amp load in a small light package.

4ohm resister will work but I don't think I can get 3600w one.

Any ideas?


Purpose is to blow breakers so does not need to take it for long but will get used often.

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propmod_us and propmod_1x1 are in stock. Only $30. PCB available for $5

Want to make projects and have Gadget Gangster sell them for you? propmod-us_ps_sd and propmod-1x1 are now available for use in your Gadget Gangster Projects.

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Comments

  • PJAllenPJAllen Banned Posts: 5,065
    edited 2009-10-03 15:55
    big, fat wire (very large gauge), ohms/feet

    could be fun

    [noparse]/noparse] wanted to say lamps, but a lamp resistance isn't constant, intially low and incr with current/temp[color=white]·[/color

    Post Edit -- We're talking about a reel or two.· BTW, when the boss says to do it this way, then... that's how we do it.


    Post Edited (PJ Allen) : 10/3/2009 4:04:21 PM GMT
  • stamptrolstamptrol Posts: 1,731
    edited 2009-10-03 15:59
    If its a breaker tester, use the highest rated wirewound resistor you can find. Proabably 50 to 100 watts shouldn't be hard to find. Design for about 500 watts total capacity. Say 5 100 watt 20 ohm resistors in parallel.

    If the breaker is working, they should stand the heat if you pay attention to how many times per minute you do the test. Design so it can't stay energized very long if the breaker fails to clear. Perhaps energize the circuit only by a momnetary switch.

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    Tom Sisk

    http://www.siskconsult.com
    ·
  • mctriviamctrivia Posts: 3,772
    edited 2009-10-03 16:58
    Spolls of wires will not work. To big.

    Will have to see how high wattage resisters I can get. I have used a switch before but that is hard on the switch and breaker.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    propmod_us and propmod_1x1 are in stock. Only $30. PCB available for $5

    Want to make projects and have Gadget Gangster sell them for you? propmod-us_ps_sd and propmod-1x1 are now available for use in your Gadget Gangster Projects.

    Need to upload large images or movies for use in the forum. you can do so at uploader.propmodule.com for free.
  • Carl HayesCarl Hayes Posts: 841
    edited 2009-10-03 17:13
    Mount a 4500w water heater heating element in a piece of pipe, full of water.

    The calculated resistance·of a 240v 4500w element (which is a resistor) is 3.2 ohms.···You want 4 ohms max, so a single 4500w element ought to serve you.· Its resistance will vary a little with temperature.· Don't run it without water surrounding it, of course.

    It costs about $12 at Lowe's or Home Depot.

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    · -- Carl, nn5i@arrl.net
  • mctriviamctrivia Posts: 3,772
    edited 2009-10-03 18:45
    http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=FSE1000-3.5-ND

    $63

    will have to check out heaters.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    propmod_us and propmod_1x1 are in stock. Only $30. PCB available for $5

    Want to make projects and have Gadget Gangster sell them for you? propmod-us_ps_sd and propmod-1x1 are now available for use in your Gadget Gangster Projects.

    Need to upload large images or movies for use in the forum. you can do so at uploader.propmodule.com for free.
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