Engineering Board Exam Reviewer · Circuit Theorems in AC Analysis · medium
A source of 60 V 0° drives a branch Z1=50-j10, in series with the parallel branch Z2=60-j10, , as shown. Terminals a and b are the open terminals across Z2. Find the Thevenin impedance seen at terminals a-b (polar form).
- 112 -10.3°,
- 27.7 -10.5°,
- 60.8 -9.5°,
- 27.7 10.5°,
Answer
B. 27.7 -10.5°,
Solution
With the source replaced by a short circuit, ZTh=Z1 Z2=Z1Z2/Z1+Z2=27.7 -10.5°, .
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