Page 400 - Basic Electrical Engineering

Here

or,

At resonance, X = X , Z = R. The circuit behaves like a resistive circuit.
L
C
Therefore, the power factor = 1. Impedance, Z = R, and current is maximum.

Figure 3.69

3.3.2 Resonance in AC Parallel Circuits

Let us consider an inductive coil and a capacitor in parallel connected across
a constant voltage variable frequency supply source as shown in Fig. 3.69 (a).

Practically, both the capacitor and the inductor will have some losses which
should be represented by a small resistance in series. Here we assume the

capacitor as a loss-less one while the inductor coil has some resistance which