Engineering Board Exam Reviewer · Circuit Theorems in AC Analysis · medium
A network has a Thevenin voltage of 120 V (rms) and a Thevenin impedance of 30+j40, . What is the maximum average power it can deliver to a load?
- 480 W
- 72 W
- 120 W
- 240 W
Answer
C. 120 W
Solution
Maximum power is delivered when ZL=ZTh*=30-j40, . Pmax= VTh24RTh=1202/4(30)=120 W.
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