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Voltage Magnification and Q-Factor

In a series resonance circuit, what causes voltage magnification across the inductor or capacitor?
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Answer & Explanation
Correct AnswerA. High quality factor (Q-factor)

Quick Explanation

At series resonance the circuit current is maximum and the reactive voltages are V_L = I X_L and V_C = I X_C. Their magnitude relative to supply is the quality factor Q, so a high Q causes strong voltage magnification.

Formula / Key Relation

VL/V = VC/V = Q
Voltage Magnification and Q-Factor explanatory diagram

Detailed Explanation

Correct Answer

A — High quality factor (Q-factor)

Explanation

At series resonance the circuit current is maximum and the reactive voltages are VL = I XL and VC = I XC. Their magnitude relative to supply is the quality factor Q, so a high Q causes strong voltage magnification.

Key Concept

Voltage Magnification and Q-Factor

Formula

VL/V = VC/V = Q

Exam Point

Resonance voltage magnification = Q.

Quick Trick

Resonance voltage magnification = Q.

Exam Tip

Resonance voltage magnification = Q.

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