Electronics - RLC Circuits and Resonance - Discussion

At resonance XL = XC having phase difference of 180 degree, hence voltage across reactive component is zero.

Can't understand please explain friends.

Ok, at resonance frequency XL = XC total impedance of circuit is resistance only if so no series reactive circuit is available so no voltage drop.

At resonant total reactance zero so no volatge drop.

At resonance, Xc=Xl. This means that the circuit has the least amount of resistance for that particular value of w which enables the Xc value to be equal to the Xl value. As at that instant, the net impedance is minimum, more current flows through the circuit at that frequency than at any other frequency.

Now, since the voltage drops across the inductor and capacitor are equal and since both of them have a phase difference of 180 degrees, the resistor is the only avenue for voltage drop to take place. Hence, at resonance in an RLC, the net voltage drop takes place across the resistor. On application of Kirchoff's law, it becomes obvious that the drop is equal to the voltage supplied by the battery.

So, the voltage across it must be equal to the source voltage. So the answer is A.