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This lecture covers the Thevenin and Norton theorems in the alternating regime, focusing on voltage sources, current sources, and passive linear elements. It explains the equivalence of circuits, providing examples and detailing the conditions for both cases where sources have the same frequency and where they do not. Additionally, it delves into the principle of superposition, illustrating how to handle cases with different frequencies and complex time domains. The transformation of complex instantaneous values into snapshots and effective phasors is thoroughly discussed, emphasizing the vector sum of contributions. The lecture concludes by highlighting the validity of the superposition principle in alternative regimes, considering different source groupings and conditions.