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October 2006

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Subject:
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Brian Ellis <[log in to unmask]>
Date:
Tue, 24 Oct 2006 16:48:41 +0300
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Guess the guy now needs a cataplasm! :D

When I saw 'video', I was expecting something like
http://www.youtube.com/watch?v=M8nT97CrgcU

Brian

Steve Gregory wrote:
> Ahhhhh, I see. You explained it so well Inge, but maybe a lot of people
> didn't understand it. Well, fortunately for them, I have this video
> posted on my web page of a catacitor that got charged with 600 VDC but
> had nowhere to discharge. So it kicked back to the resistor which in
> turn released the charged catacitor:
> http://stevezeva.homestead.com/files/pinky.wmv
>
> -Steve Gregory-
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
> Sent: Sunday, October 22, 2006 4:31 PM
> To: [log in to unmask]
> Subject: Re: [TN] NTC: Friday enigma.
>
> So, if you connect the plus pole to the front legs on a cat ( a
> catacitor), and the minus  to the rear legs, and also place your sister
> (resister) in series, and switch on the 600 VDC supply, then the cat
> will make a tremendous jump (inrush) but will come nowhere because of
> your sister, who got 50 times the weight of the cat. But the cat is
> charged with anger and will take any opportunity to kick back. I
> understand that, but the rest is hard to see. So, you paint one side of
> the cat with conductive silver epoxy, let it cure at room, which will
> take time as it follows an asymptotic curve.
> And after that you switch on again. And you say, that the cat can never
> pull the cord again and  the cord can never slacken. The only solution I
> can find, is that the cat died because  it disliked the silver epoxy and
> tried to lick it off, and as the cat's gone, it can't pull the cord any
> more. So far OK, but why can't the cord slacken? Your sister ought to
> give a shrill and run to the cat and take it up and sob and pat the cat,
> and the cord will slacken. Your insisted bilateral equipotential
> anticircumstance ....I can't fix  that.
>
> Inge
>
> PS. I'm still thinking that it's a 47 pF cap, because the end cap silver
> has migrated across, silver has atomic number 47 and when the circuit is
> switched on, you will here a tiny 'pFff' when the bridge burns off, and
> the cap works again.
>
>
>
> ----- Original Message -----
> From: "Brian Ellis" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Monday, October 23, 2006 5:23 PM
> Subject: Re: [TN] NTC: Friday enigma.
>
>
>
>>OK, the monetary value is obviously zero, as it is short-circuited by
>>the metal. But the enigma is its electrical value as a capacitor. If a
>
>
>>capacitor is connected to a DC source via a resistor to limit the
>>current, there will be an initial surge of current of a value
>>determined by the source voltage and the resistance of the circuit,
>>determined by Mr Ohm. The current will then decay exponentially as the
>
>
>>capacitor charges, providing a back EMF to the source, heading towards
>
>
>>an asymptote of zero (assuming a perfect capacitor), when it is fully
>>charged. The higher the value of the capacitor, the higher will be the
>
>
>>current after a given time, and the longer will be the decay curve. In
>
>
>>this case, after the given time, the current will be the same as the
>>initial value, indicating that the value of the capacitor will be
>>infinity farads because it can never be charged to the source voltage
>>and the charging current can never decay. :) :)
>>
>>Brian
>>
>>Brian Ellis wrote:
>>
>>>On http://stevezeva.homestead.com/files/c46.JPG there is an 'orrible
>>>photo of a ceramic capacitor. What is its value? :-) :-)
>>>
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