At resonance, the impedance of an RLC series circuit is
Correct answer: A. R
- A. R
- B. XL
- C. Xc
- D. None of the above
Explanation
The total impedance of a series RLC circuit is Z = √(R² + (XL - Xc)²). At the resonant frequency, inductive reactance (XL) equals capacitive reactance (Xc), so their difference is zero. This leaves Z = √R² = R.
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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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