What is Series Resonance?

Series resonance is a phenomenon that occurs in electrical circuits containing a resistor (R), inductor (L), and capacitor (C) connected in a series. It occurs when the inductive reactance (XL) and capacitive reactance (XC) cancel each other at a specific frequency, resulting in a minimum impedance and maximum current flow through the circuit.

At resonant frequency, the inductive and capacitive reactance are equal and opposite, resulting in resonance. The resonant frequency (f) can be calculated using the formula:

[Tex]f = \frac{1}{2 \pi \sqrt{LC}}[/Tex]

where,

• f = resonant frequency (Hz)
• L = inductance (H)
• C = capacitance (F)

At resonance, the total impedance (Z) of this circuit equals to the resistance (R), resulting in minimum impedance.

Z = R

Applications of Series Resonance

Series resonance has various applications in electronics and telecommunications, including in tuning circuits, filtering, and impedance matching. It is utilized in devices such as radio receivers, oscillators, and filters to select specific frequencies or reject unwanted ones. Some common applications of series resonance are:

• Tuning circuits in radios and televisions to select specific frequencies.

• Bandwidth control in bandpass filters for communication systems.

• Power factor correction in electrical power distribution systems to improve efficiency.

• Voltage regulation in voltage stabilization circuits.

• Frequency stabilization in oscillators and frequency synthesisers.

Series resonance and parallel resonance are two phenomena that occur in electrical circuits containing inductors, capacitors, and resistors. They represent different ways in which circuits respond to an alternating current (AC) signal at a specific frequency.

In this article, we will understand the difference between Series resonance and parallel resonance in detail.