On 29/1/2012 11:02 PM, jim wrote:
> I have a question.  Can anyone (or more than one), give me their answer t=
o
> this question...
>
> If there is a current of 10ma charging a 1uF capacitor, what is the volta=
ge
> across the capacitor at 100ms?
>
> I have calculated my answer twice, and come up with the same answer twice=
..
> But it just doesn't seem right to me.
> So, I thought I'd get an independent, impartial answer to verify or deny =
my
> answer.
>
> If you choose, put your solution to the answer down too, so I can follow
> your thinking.  I am not in school, and
> this is not a homework question.  I am just curious.  It's actually a
> problem in an electronics book, and I wanted
> to answer it, but I don't think my answer is correct, and the answer isn'=
t
> in the book.

1A into (or out of) a 1F capacitor for 1 second gives a delta-V of 1V.

Your capacitor is only e-6 F, your current is e-2, your time e-1.

I am a (part time) teacher, so I leave the rest as en exercise for the=20
student.

If your answer seems to high for you, realise that your capacitor is=20
small. 1mA for 1ms into a 0F capacitor will give an interesting effect=20
(don't try this at home).

--=20

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
C++ on uC blog: http://www.voti.nl/erblog

--=20
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