Iii4 Impedance

In the preceding section it was mentioned that pure inductance does not occur in a real-world circuit. This is because the wire that is used to form the most carefully made coil still has resistance. This section considers circuits containing resistance and inductive reactance and circuits containing resistance and capacity reactance. At-

Fig. III.10 Circuit voltages and current plotted in the complex plane. Both i and VR are on the positive real axis since they are in phase, VL is on the positive j axis since it leads the current by 90°.

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