At resonance, the impedance of RLC series circuit is:
Correct answer: A. R
- A. R
- B. XL
- C. XC
- D. None of the above
Explanation
This is the correct answer. At resonance in an RLC series circuit, the impedance is primarily resistive and is equal to the resistance (R) of the circuit. This occurs because at the resonant frequency, the inductive reactance (XL) and capacitive reactance (XC) are equal in magnitude but cancel each other out. As a result, the impedance is purely resistive, and its value is equal to the resistance in the circuit.
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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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