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Transient Response: Analyzing Current with Thevenin's & Mesh/Nodal Analysis
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[QUOTE="gneill, post: 4482475, member: 293536"] Hi pforpashya. Welcome to Physics Forums. I'm not sure that I understand your question accurately. I believe that you wish to know when and why to include the initial capacitor voltage in the analysis, is that correct? For the first step in your analysis you determined the potential on the capacitor at time t = 0 (just before the switch K is closed). That becomes the initial potential on the capacitor for the next steps in the analysis. Since you're only looking to find the capacitor current you don't really care where the initial capacitor voltage ends up in the modelling process. If you choose to use a Thevenin equivalent model for the analysis, then you can either treat the capacitor and its initial voltage as the load that is separated from the circuit when you build the model, or you can take the uncharged capacitor as the load and leave its initial voltage with the rest of the circuit when you create the Thevenin model. So the choices are: [ATTACH=full]163461[/ATTACH] In the top circuit, the initial capacitor voltage V[SUB]o[/SUB] remains with the load and the Thevenin voltage V[SUB]th[/SUB] depends only on the 5V source in your circuit. In the bottom circuit, V[SUB]o[/SUB] has been folded into the Thevenin model, so V'[SUB]th[/SUB] depends upon both the 5V source and V[SUB]o[/SUB]. Does that help you? [/QUOTE]
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Transient Response: Analyzing Current with Thevenin's & Mesh/Nodal Analysis
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