Re: physical/intuitive understanding of RL/RC time constants?
From: Peter Lawton (peter_john.lawton_at_virgin.net)
Date: 10/26/04
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Date: Tue, 26 Oct 2004 14:53:08 GMT
"BobGardner" <bobgardner@aol.comma> wrote in message
news:20041025192028.17053.00001819@mb-m26.aol.com...
> >when a current just starts flowing into a RL or RC circuit, how does
> >the voltage "know" that it should be increasing exactly 63% during
> >each time-constant period?
> ==================
Time itself is defined by the charging of the capacitor.
The real question is why a pendulum etc agrees with the charging.
Peter Lawton
> The cap starts out discharged, so a lot of current flows at first, then
less
> and less and less as the voltage and charge builds up on the cap. Plot
it...
> charging toward 12 volts ... starts at 0, then half way to 12 would be 6,
then
> half way to 12 would be 9, then half way to 12 would be 10.5, then half
way to
> 12 would be..... hey... it might not ever get there!
>
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