Question
What is an effect of increasing Q in a series resonant circuit?
Answer Options
- A) Fewer components are needed for the same performance
- B) Parasitic effects are minimized
- C) Internal voltages increase
- D) Phase shift can become uncontrolled
Correct Answer: C
Explanation
In a series resonant circuit operating at its resonant frequency, the maximum current flows through the circuit. The voltage across the individual reactive components (inductor V_L and capacitor V_C) is determined by V = I \times X_L (or V = I \times X_C). The Q of the circuit is defined as the ratio of this reactive voltage to the external applied voltage: Q = V_L / V_{\text{applied}}.
Therefore, an effect of increasing Q in a series resonant circuit is that the internal voltages increase. This means that a high-Q series circuit operating at resonance will have very high voltages developed across the inductor and capacitor, potentially many times greater than the driving voltage. Components in high-Q circuits must be selected with voltage ratings high enough to safely handle these internal voltage spikes.
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