Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Alternating Current

Question:

Case: Read the passage and answer accordingly

An LCR circuit, also known as a resonant circuit, tuned circuit, or an RLC circuit, is an electrical circuit consisting of an inductor (L), capacitor (C) and resistor (R) connected in series or parallel. The LCR circuit analysis can be understood better in terms of phasors. A phasor is a rotating quantity. The quality factor is defined as the ratio of the voltage drop across the inductor or capacitor to that of applied voltage. It measures the sharpness of resonance of an LCR circuit.

In a series RLC circuit that is operating above the resonant frequency, the current;
Options:
Lags the applied voltage
Leads the applied voltage
Is in phase with voltage
None of the above
Correct Answer:
Lags the applied voltage
Explanation:
The circuit behaves as a inductive circuit at a frequency higher that resonant frequency and the current lags behind the voltage in an inductive circuit.