Engineering Board Exam Reviewer · Circuit Theorems in AC Analysis · hard
A source has a Thevenin impedance of 30+j40, . The load is a variable pure resistance. What value of load resistance receives the maximum power?
- 50,
- 30,
- 40,
- 70,
Answer
A. 50,
Solution
When only the magnitude of the load impedance can be varied (here a pure resistance), maximum power occurs when RL=|ZTh|=sqrt(302+402)=50, .
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