Basic AC Reactive Components
Inductive reactance of the coil
Current through the circuit
Draw a phasor diagram showing the phase relationship between current and
Phasor diagram showing the current lagging voltage by 90° is drawn in Figure 2b.
Inductive reactance is summarized below.
Inductive Reactance Summary
Opposition to the flow of alternating current caused by inductance is called
Inductive Reactance (XL).
The formula for calculating XL is:
XL = 2pfL
Current (I) lags applied voltage (E) in a purely inductive circuit by 90° phase
The phasor diagram shows the applied voltage (E) vector leading (above) the
current (I) vector by the amount of the phase angle differential due to the
relationship between voltage and current in an inductive circuit.