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Thevenin's theorem says any linear two-terminal network can be replaced by which equivalent?
ASingle voltage source V_TH in series with Z_TH
BSingle current source I_N in series with Z_N always
CA short-circuit only (zero source) under any case
DA pure reactive element with no resistance at all
Answer & Solution
Correct answer: A. Single voltage source V_TH in series with Z_TH
Thevenin: V_TH = open-circuit voltage at terminals; Z_TH = impedance looking in with independent sources zeroed. Norton is the parallel-current dual.
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