Question
What combines to create the self-resonance of a component?
Answer Options
- A) The component’s resistance and reactance
- B) The component’s nominal and parasitic reactance
- C) The component’s inductance and capacitance
- D) The component’s electrical length and impedance
Correct Answer: C
Explanation
Any physical electrical component (resistor, capacitor, or inductor) is non-ideal and inherently possesses small amounts of the other two characteristics. For instance, a capacitor has parasitic series resistance (ESR) and parasitic series inductance (ESL). A self-resonant frequency occurs when the component’s internal energy storage mechanisms cancel each other out.
Self-resonance is fundamentally a special case of an RLC tuned circuit. It is created when the component’s internal parasitic inductance and capacitance combine to form a resonant network. For an inductor, the coil’s inductance resonates with its parasitic inter-turn capacitance; for a capacitor, its capacitance resonates with its parasitic series inductance (ESL).
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