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)
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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