physical/intuitive understanding of RL/RC time constants?
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Posted by Alan Horowitz on October 11, 2004, 7:11 pm
Please log in for more thread options the voltage "know" that it should be increasing exactly 63% during each time-constant period? And whence the number 63%? | |||||||||||||||||||||||||
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Posted by Uncle Al on October 11, 2004, 7:18 pm
Please log in for more thread options 1-(1/e). Crack your textbook. <http://www.iop.org/EJ/S/UNREG/aS0aOQcupwxj4CNeiM5vaQ/article/-featured=jnl/0143-0807/23/1/304/ej2104.pdf>
"Demonstration of the exponential decay law using beer froth"
"exponential decay" 63 20,500 hits Uncle Al gotta think of everything. -- Uncle Al http://www.mazepath.com/uncleal/ (Toxic URL! Unsafe for children and most mammals) http://www.mazepath.com/uncleal/qz.pdf | |||||||||||||||||||||||||
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Posted by Richard Clark on October 12, 2004, 4:02 am
Please log in for more thread options wrote:
><http://www.iop.org/EJ/S/UNREG/aS0aOQcupwxj4CNeiM5vaQ/article/-featured=jnl/0143-0807/23/1/304/ej2104.pdf>
> "Demonstration of the exponential decay law using beer froth" Hi Al, Good link. Here is one that is Tau intensive from my own work: http://www.cybernalysis.com/tau/index.htm 73's Richard Clark, KB7QHC | |||||||||||||||||||||||||
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Posted by John Popelish on October 12, 2004, 12:11 am
Please log in for more thread options Alan Horowitz wrote:
>
> 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? > > And whence the number 63%? This all goes back to the solution of the differential equation for the RC or RL system. e is a natural constant that has some very sweet properties in many applications of mathematics, and simplifying differential equations is one of them. Read through this tutorial and see how the rate constant k in this tutorial is an example of a time constant. http://www.ugrad.math.ubc.ca/coursedoc/math100/notes/diffeqs/intro.html -- John Popelish | |||||||||||||||||||||||||
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Posted by John T Lowry on October 12, 2004, 2:24 am
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> 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? Definition of time-constant period. John Lowry Flight Physics >
> And whence the number 63%? | |||||||||||||||||||||||||
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> 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?
>
> And whence the number 63%?