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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 VTH
i =20 ∠ 0o/11 - 3j
= 1.692 + 0.461 j Amp
VTH = VAB = i (6 - 3 j) = 11.53 - 2.3 j Volt
Figure 4.66
Calculation for ZTH
ZTH = 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.
RL = | ZTH |
Case II
Load is complex :
Z L = Z * TH (Complex conjugate of ZTH)
= 2.88 + 0.576 j Ω
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