At resonance in R.L.C series A.C circuit which is correct:
Correct answer: A. The impedance is minimum
- A. The impedance is minimum
- B. The voltage across the inductor (VL) is greater than the applied voltage
- C. The voltage across the capacitor (VC) is greater than the applied voltage
- D. All of the above
Explanation
In an RLC series AC circuit at resonance, the impedance is at its minimum. This occurs because the inductive reactance (XL) equals the capacitive reactance (XC), thus canceling each other out, leaving only the resistive component. Therefore, the circuit behaves as if it only has resistance, leading to the lowest possible impedance. Options B and C discuss phenomena that can occur at resonance due to voltage magnification, but they do not define resonance. Option D is incorrect because not all statements are correct in the context of resonance definition.
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About Alternating Current
Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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