In an RLC series AC circuit, if the applied frequency is less than the resonance frequency, then which is true?
Correct answer: D. All of the above
- A. The circuit behaves as a capacitive circuit.
- B. XC > XL
- C. Current leads the voltage.
- D. All of the above
Explanation
When the frequency is below resonance, Xc is greater than XL , which defines the circuit as capacitive. In a capacitive circuit, the current leads the voltage. Therefore, all three statements are true.
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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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