In a series RLC circuit, what happens at resonance? (2020)

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Question: In a series RLC circuit, what happens at resonance? (2020)

Options:

Correct Answer: Impedance is minimum

Exam Year: 2020

Solution:

At resonance in a series RLC circuit, the impedance is minimum, and the circuit behaves like a purely resistive circuit.

In a series RLC circuit, what happens at resonance? (2020)

In a series RLC circuit, what happens at resonance? (2020)

Step 1: Understand what a series RLC circuit is. It consists of a resistor (R), inductor (L), and capacitor (C) connected in a single loop.
Step 2: Know what resonance means. Resonance occurs when the frequency of the applied voltage matches the natural frequency of the circuit.
Step 3: At resonance, the inductive reactance (XL) and capacitive reactance (XC) cancel each other out. This means XL = XC.
Step 4: When XL and XC cancel, the total impedance (Z) of the circuit is at its minimum value, which is equal to the resistance (R).
Step 5: With minimum impedance, the circuit allows maximum current to flow, and it behaves like a purely resistive circuit.

Resonance in RLC Circuits – At resonance, the inductive and capacitive reactances cancel each other out, resulting in minimum impedance and the circuit behaving like a purely resistive circuit.