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From: Sarason on 17 Mar 2010 19:04
On 13/03/2010 4:54 AM, D from BC wrote:
> I'm setting up a test circuit and I need a 100k resistor that can handle
> 2000VAC for a few seconds.
>
> I was going to run off to the local surplus shop but got the idea of
> making a liquid resistor. Saves a trip.
>
> I added some salt to water and got 100kohm. Copper electrodes (all I got
> at the moment).
>
> Question is... Will this stay 100kohm +/- 10kohm up to 2000VAC?
> My circuit only needs to run for 5 seconds.
>
> iows...Does salty water resistance vary with voltage?
>
Of course it does, look up any high school text on electro-chemistry.
Acid dissociation constant is a good phrase. Electrovalency etc.
Wikipedia has a reasonable article.
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