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Re: [Phys-L] RLC lab



John D said in part:
"Given: Series RCL, drive the stack with constant voltage,
measure voltage across the inductor.

At low frequency, the L is a dead short, the C is an
open circuit, and the R is a detail.
Measured V is small and falls off at 12 dB per octave."
I expect John intended to say that voltage across the (ideal) inductor RISES with frequency?

On Tuesday, April 19, 2022, 10:23:48 AM CDT, Brian Whatcott <betwys1@sbcglobal.net> wrote:

Here is a paper on iron core inductors which mentions self-resonance and a graph showing how reactance may fall to zero at some frequency (graph 5)

https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.982.6662&rep=rep1&type=pdf

    On Tuesday, April 19, 2022, 09:10:21 AM CDT, Zani, Gerald via Phys-l <phys-l@mail.phys-l.org> wrote: 

There is an interesting statement in a relevant TPT article:

The Driven RLC Circuit Experiment
TPT 37, 424 (1999);
Philip Backman, Chester Murley, and P. J. Williams, Physics Department,
Acadia University, Wolfville, NS, Canada

It states, and this is *not* a word-for-word quote, my interpretation:

"If the resistance of the inductor is not negligible compared with the
reactance of the inductor at the resonance frequency then the voltage
across the inductor can not be treated as a pure reactive voltage. To
obtain the voltage due to a purely inductive reaction then you must
determine the resistive voltage across the inductor and subtract that from
the total voltage measured across the inductor. "

This article uses three equations to obtain the appropriate potential
differences from the acquired potential differences across the components.

Let me know if you need a copy.

- Jerry

--
Gerald Zani
Senior Engineering Technician
Brown University School of Engineering
(401) 863-9571
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