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'[ee]: how to calculate time constant'
2001\04\07@083124 by Raj D.kumar

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Hi,

If R and C are in parallel how to calculate the time constant.??

Thanks,

Raj

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2001\04\07@095732 by Chris Carr

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Raj D.kumar wrote


> Hi,
>
> If R and C are in parallel how to calculate the time constant.??
>
> Thanks,
>
> Raj
>
Typing "Time Constant" into Google brought up this as the eleventh result

http://www.sweethaven.com/acee/forms/frm1002.htm

Regards

Chris

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2001\04\07@110914 by Andy Howard

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> From: "Raj D.kumar" <spam_OUTDurairaj.RajkumarTakeThisOuTspamAPCC.COM>

> Hi,
>
> If R and C are in parallel how to calculate the time constant.??


t = R * C seconds, where R is in ohms and C in Farads.

This is the time for a capacitor to charge or discharge through a resistor
by approx 63% (actually 1/e). It applies equally to parallel and series
arrangements.

As an approximation the capacitor will charge or discharge to around 1% of
it's eventual value, i.e fully charged or discharged, in five times the time
constant.

These numbers are theoretical but other factors, e.g. leakage in the
capacitor, will affect the actual result. In general the calculation becomes
less of a match for real-world circuits for higher values of t.

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2001\04\08@104146 by Olin Lathrop

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> If R and C are in parallel how to calculate the time constant.??

Time constant = R * C, whether parallel or series.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, .....olinKILLspamspam@spam@embedinc.com, http://www.embedinc.com

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2001\04\08@114046 by Olin Lathrop

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> t = R * C seconds, where R is in ohms and C in Farads.

With these specific units of R and C, T will be in seconds.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olinspamKILLspamembedinc.com, http://www.embedinc.com

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2001\04\08@130755 by Andy Howard

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From: "Olin Lathrop" <.....olin_piclistKILLspamspam.....EMBEDINC.COM>


>  > t = R * C seconds, where R is in ohms and C in Farads.

> With these specific units of R and C, T will be in seconds.


Er, that's what it said.

Time for some new spectacles?  :o]

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2001\04\09@154927 by Dan Michaels

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>>
>Typing "Time Constant" into Google brought up this as the eleventh result
>
>http://www.sweethaven.com/acee/forms/frm1002.htm
>

While tracking down the tutorial cited, I ran across the following one
on Marine Electricity - lots of good stuff on batteries, different types
of motors, etc.

http://www.free-ed.net/fr02/lfc/course0203_04/


- dan michaels
http://www.oricomtech.com
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