In a series RLC ac circuit, a second resistor is connected in series with the resistor previously in the circuit. As a result of this change, what happens to the impedance of the circuit?
A) It increases for frequencies below resonance and decreases for frequencies above resonance.
B) It decreases for frequencies below resonance and increases for frequencies above resonance.
C) It increases.
D) It decreases.
E) It does not change.

Question

Quizplus · Accepted Answer

Adding a resistor in series with the existing components of an RLC circuit increases the resistive part of the impedance without affecting the reactive (inductive and capacitive) parts. Therefore, the overall impedance of the circuit increases regardless of the frequency.

In a Series RLC Ac Circuit, a Second Resistor Is