Thevenin101 - EE201 Thevenin 101 Oct. 17, 2006 Summary: The...

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EE201 Thevenin ‘101’ Oct. 17, 2006 Denard Lynch Page 1 of 3 Summary: The purpose of this note is to provide a brief guideline on when and how to use Thevenin and Norton equivalents to help with circuit analysis. It provides some simple steps for determining the equivalents as well as an example to demonstrate the process. Finally, it provides a couple of cautions about the limitations of using equivalents. Why use equivalents? Simply stated, an equivalent circuit can be used to simplify determination of the voltage across, or current through a specific element. In order to do this, we replace a rather complicated network of components with a simple 2-element replacement that acts exactly the same as far as the target component is concerned. Using the equivalent network to find the voltage or current through the target component is usually not a problem. The challenge is determining the equivalent itself, and sometimes when it will be helpful or necessary to do so. When to use equivalents: There are many techniques that can be used for circuit analysis, and they will all give the same result. While there is often some advantages in using one method versus another in a specific circuit situation, which one you use will depend on the questions you are trying to answer and your personal familiarity and expertise at applying them. This note will focus on the analysis you will typically have to do for transient D.C. circuits. In these cases, a Thevenin or Norton equivalent is often very useful. You will typically require an equivalent if the network between a source(s) and the target component (i.e. the component of interest) has a combination of series and parallel components. Another, but less obvious way to tell is if the circuit is such that varying the current or voltage in the target component will affect the voltage or current at the
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Thevenin101 - EE201 Thevenin 101 Oct. 17, 2006 Summary: The...

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