ABSTRACT
In a purely resistive a.c. circuit, the current IR and applied voltage VR are in phase. See Figure 17.1.
In a purely inductive a.c. the applied voltage VL Figure 17.2.
In a purely inductive flow of alternating
reactance, XL
XL = VLIL = 2πfL
where f is the supply frequency, in hertz, and L is the inductance, in henrys. XL is proportional to f , as shown in Figure 17.3.
