Capacitive reactance ( XC) is a measure of a capacitor’s opposition to alternating current. It is measured in ohms like resistance but reactance is more complex than resistance because its value depends on frequency (f) of the electrical signal passing through the capacitor.
A Capacitor is a current storing device. In electrical and electronic systems, reactance is all about the opposition of a circuit element to changes in current or voltage due to that element’s capacitance.
When the capacitor is connected to a DC supply voltage, it becomes charged to the value of the applied voltage, acts as a temporary storage device and maintains this charge as long as the supply voltage is present.
Capacitive Reactance Formula is expressed by
L = inductance of the circuit,
C = capacitance and
f = frequency of ac mains