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Network Theorems I ENTC 210: Circuit Analysis I Rohit Singhal Lecturer Texas A&M University The Theorems Superposition Theorem Thevenin’s Theorem Norton’s Theorem Superposition Theorem When there are multiple sources! The current through, or voltage across, an element in a linear network is equal to the algebraic sum of the currents or voltages produced independently by each source. Superposition Theorem DC Superposition Theorem Superposition Theorem DC Superposition Theorem DC Superposition Theorem Number of Networks Analyzed = Number of independent Sources Thevenin’s Theorem Any two terminal, linear dc network can be replaced by an equivalent circuit consisting of a voltage source and a series resistor. Thevenin’s Theorem DC Thevenin’s Theorem Steps First remove the portion of the network, whose equivalent has to be found Mark the terminals of the remaining 2 terminal network Thevenin’s Theorem Steps to calculate Rth Calculate Rth by setting all sources to zero, and using reduction techniques. Steps to calculate Eth Return all sources to their original position and find the open terminal potential.