What Is Series Resonance Circuit?

In RLC series circuit, when the circuit current is in phase with the voltage, the circuit is said to be in Series Resonance. The resonance condition in the circuit arises when the inductive reactance is equal to the capacitive reactance. The series resonant circuit has the ability to absorb heavy current and power from the mains.

In a series resonant circuit,

At resonance

XL-XC = 0 or XL = XC

The impedance is given by the equation,


Putting the value of XL; XC as 0, we get

Zr = R

From this, it is clear that at resonance, the opposition to the flow of current is only provided by resistance. At this condition, the circuit draws the maximum current.

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