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Example 4.10 Irwin, Page 127

Example 4.10 Irwin, Page 127. Find the Thevenin equivalent circuit at points A-B for the circuit shown. We need to find two quantities: V TH = V oc and R TH = V oc /I SC

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Example 4.10 Irwin, Page 127

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  1. Example 4.10 Irwin, Page 127 Find the Thevenin equivalent circuit at points A-B for the circuit shown. • We need to find two quantities: VTH = Voc and RTH = Voc/ISC • If we use nodal analysis and/or mesh analysis or any other appropriate techniques, we find VTH = 0V and ISC = 0A (because there are no independent sources of power in the circuit) • RTH = Voc / ISC = 0V/0A = ????? • VTH = 0V is equivalent to a short circuit • ISC = 0A is equivalent to an open circuit • The Thevenin (Norton) equivalent consists of a single resistor. ENGR-201 Example 4.8

  2. Example 4.10 – Find RTH To make our work easier, we will find RTH to the at points C-D first. To find RTH apply a known voltage source (1V) and determine the amount of current demanded. . ENGR-201 Example 4.8

  3. Example 4.10 – Find RTH at C-D We can now replace the circuit to the left of points C-D with its Thevenin equivalent. ENGR-201 Example 4.8

  4. Example 4.10 – Find RTH The Thevenin (and Norton) equivalent circuit, then, is ENGR-201 Example 4.8

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