resonance in RLC circuit

could someone explain what resonance is?

what is the difference between near resonance and practical resonance ? what is the natural frequency of a circuit and what is omega (w) ? when does a beat pattern occur ?

and what is the signal that has resonance ? the source ? the current ? the voltage in a parallel cicruit ?

could you describe what a graph of this function look like ? (is it sinusoidal, but always bigger magnitude ?)

thanks

Reply to
tbone
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I'm going to do this all wrong and people are DEFINATELY going to pick holes, BUT...

in an RLC circuit, it's when the impedance of the capacitor and inductor "cancel" - their imaginary components (jw) cancel.

not a scoobies!

"omega r" (wr) is the resonant frequency in radians/sec. This is often termed the "natural frequency"

For beating to occur, you need two slightly different frequencies - take the analogy of a guitar being tuned; as the note your tuning approaches a reference, you can hear a beating frequency.

pass

The frequency response of a resonant circuit has a large peak at w0. The rest of the graph depends on the circuit in question.

Adam.

Reply to
Adam M

so much for a group about electrical engineering

Reply to
tbone

Hi tbone,

You can probably find some good descriptions of resonance in electrical circuits by doing a search on the Internet. I went to Google

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typed in "electric circuits resonance" without quotes and found a pretty good site right off the bat,

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and another one,

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If you'd prefer books, I'd recommend _Schaum's Guide to Electric Circuits_ by Edminster. _Engineering Circuit Analysis_ by Hayt and Kemmerly, and _Network Analysis_ by Van Valkenberg as excellent sources.

To really understand resonance it helps to be able to understand the mathematical models used in the standard descriptions. The typical math model for a simple RLC resonant circuit involves a second-order linear ordinary differential equations with constant coefficients. If you need help with understanding what that means, find an introductory text (sophomore college level, usually) on ordinary differential equations and they'll usually talk about resonance when they get to solution of second-order ordinary differential equations whose auxiliary equations have complex conjugate solutions.

Also, realize that resonance is not just a phenomenon observed in electrical circuits, but also in many types of physical systems. For example, most of the texts I've seen on linear systems theory you'll see electrical parameters (resistance, capacitance, etc.) compared with mechanical, thermal, and fluid systems. The math is the same for certain arrangements of elements in each type of system.

Try looking up some of this information on your own and ask the question(s) again if you still have them after that.

Good luck and happy holidays,

-MC

Reply to
Null Set

Like the previous Tacoma Narrows Bridge!

Reply to
BG

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