Electrical Engineering ⇒ Topic : Application of Admittance Method

Application of Admittance Method

Consider a parallel a.c. circuit consisting of three branches as shown in Fig. (a) The total conductance of the circuit is the sum of the conductances of the individual branches. However, total susceptance is the algebraic sum of susceptances of the individual branches. Remember, inductive susceptance is negative while capacitive susceptance is positive. It is an important point.

                                                     figure (a)

The magnitudes of various circuit values are

      (i)                       Total conductance, G = G₁+ G₂ + G₃

It Φ is positive, then current leads the voltage and if Φ is negative, current lags behind the voltage.

It can be seen that only conductance of the circuit is responsible for power dissipation.