Determine the load - Thevenins Equivalent Circuit:
Determine the load for which the source shall transfer the maximum power if load is connected across the terminal A and B, under the following conditions :
1. load is resistive, and
2. load is complex
Solution
Calculation for V_{TH}
i =20 ∠ 0^{o}/11 - 3j
= 1.692 + 0.461 j Amp
V_{TH} = V_{AB} = i (6 - 3 j) = 11.53 - 2.3 j Volt
Figure 4.66
Calculation for Z_{TH}
Z_{TH} = 5 (6 - 3 j) /11 - 3 j = 2.88 - 0.576 j Ω
Thevenin's Equivalent Circuit
Case I
Load is resistive, then value of load resistance shall be equal to magnitude of ZTH.
R_{L} = | Z_{TH }|
Case II
Load is complex :
Z L = Z ^{*} _{TH} (Complex conjugate of ZTH)
= 2.88 + 0.576 j Ω