Page 39 - NETWORK ANALYSIS
P. 39

32
                                                                                                                       Thevenin Theorem

                       Step 1


                       Remove the 6Ω resistor and replace current source with an open circuit.



                                                                            A








                                                                             B


                                                           Figure 2.2(b)



                       Thevenin resistance, Zth is the impedance measured across points A and B looking back
                       into the circuit.







                                                                A














                                                                B

                                                       Figure 2.2(c)


                                            Zth  = (3 + j4) Ω is parallel to (-j5) Ω]

                                             = [(3 + j4) //(-j5)]

                                               =  (3+j4)(−j5)
                                                (3+j4−j5)

                                             = (7.5 – j2.5) Ω
   34   35   36   37   38   39   40   41   42   43   44