Resonance is best defined as the voltage and current applied to the circuit are
in phase: thus what happens in any branch is immaterial. Using that definiton,
you have a definition that applies to both series and parallel circuits,
regardless of Q.
>My dummy load is non-resonant, so that's a problem?<
As long as V and I are in phase it looks resistive, whetehr it's a tuned
circuit or a resistor. Looked at as a single port network at one frequency, you
couldn't tell if it was a resistor or some sort of tuned network.
And I saw a recent equipment standard where a 'artificial antenna' was (badly,
in this case) defined as a 'substantially non radiating tuned load'
The 'XL = XC' definition is not a good one: it's either been adopted in the
Extra exam because those producing the questions don't appreciate the problems
when Q is low (or don't understand AC theory), or alternatively, they feel that
the oversimplification is a good thing. But it does break the usual rules for
producing multiple choice (otherwise known as 'vote for Joe') exams.
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