Basic AC Reactive Components
Current flowing in the circuit
Phasor diagram showing current leading voltage by 90° is drawn in Figure 4b.
Capacitive reactance is summarized below.
Capacitive Reactance Summary
Opposition to the flow of alternating current caused by capacitance is called
capacitive reactance (XC).
The formula for calculating XC is:
Current (I) leads applied voltage by 90o in a purely capacitive circuit.
The phasor diagram shows the applied voltage (E) vector leading (below) the
current (I) vector by the amount of the phase angle differential due to the
relationship between voltage and current in a capacitive circuit.