Confused about phase difference

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Phase difference should be small when resonance is small because it indicates that the system is closely aligned with its natural frequency. When the forcing frequency matches the natural frequency, the phase difference between voltage and current becomes zero, signifying resonance. A swept-frequency plot of a parallel RLC circuit shows this relationship clearly, with voltage amplitude and phase difference represented distinctly. The resonant frequency in this case is 1000 Hz, emphasizing the importance of frequency alignment for minimal phase difference. Understanding this concept is crucial for analyzing circuit behavior at resonance.
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Why should phase difference be small when resonance is small?
 
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do you mean why should the phase difference be small when the forcing frequency and natural frequency are the same ?
 
Here is (in thumbnail) a swept-frequency plot of the voltage across a parallel RLC circuit. A constant current source (1 mA) is used. The resonant frequency is 1000 Hz. The voltage amplitude (solid line) is on the left. The phase (dotted line) is on the right. The phase difference (between voltage and current) equals zero when the forcing frequency and the natural frequency are the same.

Bob S
 

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