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ECE201_12_Jung (1)

# ECE201_12_Jung (1) - ECE 201 Lecture 12 Thevenin's and...

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ECE 201 Lecture 12 Thevenin's and Norton's Theorems

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Why Equivalent Circuits? Linear Network (Resistors, indep. & dep. Sources) Load Want to simplify this part as much as possible Want to analyze v & i for different loads i + - v
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Determine V s and R Problem: suppose we know that the two-terminal network is a voltage source V s in series with a resistor R , how do we obtain their values by experiment? 1. Leave the two terminals open, measure the voltage drop v oc across them. We have V s = v oc 1. Short circuit the two terminals, measure the current i sc from + to - Since i sc = V s / R , R = V s / i sc R = V oc / i sc Alternatively, if possible, set the source to zero. Then R is the equivalent resistance looking into the two terminals
Determine I s and R Problem: suppose we know the two-terminal network is a current source I s in parallel with a resistor R , how do we obtain their values by experiment? 2. Leave the two terminals open, measure the voltage drop v oc across them. We have v oc = RI sc , so R = v oc / I sc 1. Short the two terminals with a wire, measure the current i sc

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• Spring '09
• Bobo
• Thévenin's theorem, Current Source, equivalent resistance, Norton equivalent circuit, Two-Terminal Networks, two-terminal network

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