The phase angle of a series RLC circuit at resonance is
Correct answer: C. 0°
- A. 180°
- B. 90°
- C. 0°
- D. None of these
Explanation
At resonance, the inductive and capacitive reactances cancel, making the circuit behave as if it were purely resistive. In a resistive circuit, the voltage and current are perfectly aligned, so the phase angle between them is 0°.
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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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