In RLC series circuit when the frequency of AC source is very low, the circuit an:
Correct answer: B. capacitive circuit
- A. resistive circuit
- B. capacitive circuit
- C. inductive circuit
- D. resonant circuit
Explanation
At low frequencies, the series circuit is capacitive as Xc>Xl, but at higher frequencies, the series circuit is inductive as Xl>Xc. With the decrease in frequency, it becomes more capacitive, i.e., the current decreases, and it changes from inductive to capacitive.
This question appeared on the ETEA MDCAT 2011 paper, which you can sit online with every answer explained.
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Alternating current through a resistor, capacitor and inductor involves phase relationships between voltage and current, reactance, impedance and energy transfer. A resistor keeps voltage and current in phase, while a capacitor and inductor produce opposite phase shifts, a distinction used in circuit diagrams and numerical calculations.
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