Capacitive reactance is a complex number with a phase angle of -90 degrees. I hope this helps! The two factors that determine the capacitive reactance of a capacitor are: Frequency (f): The higher the frequency of the AC signal, the lower the capacitive reactance.
The resistance of a capacitor to the flow of AC current is measured as capacitive reactance. We measure it in ohms (), which is represented by the symbol ‘Xc’. Capacitive Reactance Formula: The magnitude of capacitive reactance depends on the frequency (f) of the AC signal and the capacitance (C) of the capacitor.
In AC circuits, there are two essential concepts with different functions: impedance and capacitive reactance. Capacitive reactance is the resistance to current flow in a capacitor, whereas impedance refers to both resistive and reactive components.
A capacitor has both resistance and reactance, therefore requiring complex numbers to denote their values. Reactance in capacitor is created due to current leading the voltage by 90°. Normally the current and voltage follows Ohm's law and are in phase with each other and vary linearly.
Capacitive reactance is also inversely proportional to capacitance. Capacitance and capacitive reactance both changes when multiple capacitors are introduced to the existing circuit. It changes based on how they are connected i.e. series or parallel.
Inductive reactance (X L) rises with an increase in frequency, whereas capacitive reactance (X C) falls. In the RC Network tutorial we saw that when a DC voltage is applied to a capacitor, the capacitor itself draws a charging current from the supply and charges up to a value equal to the applied voltage.