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THEVENIN'S THEOREM states that any linear two-terminal network can be REPLACED by
Aan ideal voltage source only
Ban ideal current source in parallel with a resistor
Ca single voltage source in series with a resistor
Dtwo batteries in parallel
Answer & Solution
Correct answer: C. a single voltage source in series with a resistor
1. THEVENIN: any linear two-terminal network is equivalent to a single voltage source $V_{TH}$ in series with a resistor $R_{TH}$.
2. $V_{TH}$ = open-circuit voltage at the terminals.
3. $R_{TH}$ = resistance seen looking back into the network with all independent sources DEACTIVATED (voltage sources → short, current sources → open).
4. Greatly simplifies analysis of complex circuits.
5. Option B is NORTON's theorem. Other options are wrong.
_Source: Tony Kuphaldt, "Lessons in Electric Circuits — DC", Vol I, Ch 10 (Thevenin)._
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