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# Re: Total current in a high energy disharge.

- To: femm@yahoogroups.com
- Subject: Re: Total current in a high energy disharge.
- From: jim271@hotmail.com
- Date: Tue, 17 Apr 2001 01:27:49 -0000
- In-reply-to: <8f.963106d.280cc605@aol.com>
- User-agent: eGroups-EW/0.82

    Neglecting resistance in the external circuit, the peak current is
    given by:

    Imax=V*sqrt(C/L) = 450*sqrt(7e-3/7e-6) = 14,230 Amps.

    The actual current will be much less due to resistance but it might
    still be a few thousand amps.

    The bleeder resistor can be 10K to 50K. If you use 10K, the wattage
    can be 20W. The discharge time constant will be 70 seconds, so it
    takes a while before the cap is safe.

    Always leave a resistor connected across the cap when it's
    disconnected. This keeps the charge that was stored in the dielectric
    from slowly recharging the cap to a substantial voltage.

    The bleeder resistor can be carbon, metal, or wire wound. Wire wound
    will probably be the least expensive. Inductance won't matter.

    -- Jim

    --- In femm@y..., fucian@a... wrote:
    > Ok, I was thinking of adding resistance to lower current draw.Im
    fully aware
    > of the dangers.I dont fool around like you may think.One thing is I
    need to
    > know the type of resistor to use as a bleeder.I know I need like a
    10K 50
    > watt or so but what TYPE is good?Im thinking metal oxide?
    >
    > Matt

- References:
  - Re: [femm] Total current in a high energy disharge.
    - From: fucian@aol.com

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