I keep getting “Resonance” questions wrong in Alternating Current. What's the trap?
thinking resonance gives maximum impedance.
The usual trap: thinking resonance gives maximum impedance. How to avoid it: at resonance Z = R (smallest), so current peaks — that's radio tuning. Go back to the definition — in a series LCR circuit at f = 1/(2π√LC), XL cancels Xc so impedance is minimum and current is maximum.
Key point
Resonance
Common mistake
thinking resonance gives maximum impedance.
Memory tip
at resonance Z = R (smallest), so current peaks — that's radio tuning.
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