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# L14 - THEVENIN EQUIVALENT Using Source Stransformations...

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Lecture 14 Sept 26 Sumit Chaudhary Office: 2124 Coover

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Reading and HW Read sections 4.10 and 4.11 Study solved examples in these sections. They are nice and useful HW – 4.68 and 4.71 (due Monday) Mallard – due Monday
Mesh vs. node analysis

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Source Transformations If load resistance R L is connected across a and b L s L R R v i + = s L L i R R R i + = R v i s s = Thus in above transformation, using the condition ensures that current in RL would be the same for (a) and (b)
Assessment Prob. 4.15

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Thevenin Equivalent Circuit
Finding Thevenin Equivalent Circuit sc Th Th i V R = Determine V Th and R Th Open circuit voltage across a and b = V Th Short circuit current = i sc

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Thevenin Equivalent Example Find v ab and i sc from above circuits using nodal analysis, mesh Analysis or any method….. OR use source transformations for independent sources.
Thevenin Equivalent Example 0 3 20 5 25 1 1 = + v v V v Solving 32 , 1 = V v Therefore Th 32 , = 1 v Now place a short circuit across a and b 0 4 3 20 5 25 2 2 2 = + + v v v V v 16 2 = A i sc 4 4 16 = = Ω = = 8 sc Th Th i V R For answer, always give values and draw circuit.

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NORTON EQUIVALENT

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Unformatted text preview: THEVENIN EQUIVALENT Using Source Stransformations Assessment Prob. 4.18 Simpler method to find Rth If there are only independent sources in the circuit, deactivate them Then find total resistance looking into the network at designated terminal pair For deactivation, short the V sources and open the I sources Ω = + = = 8 25 20 5 4 x R R Th ab Another method to find Rth if there are dependent sources in the circuit • You cannot de ‐ activate dependent sources like you can with independent sources. • Hence you cannot do series parallel combination of resistors to find R eq (R th ) across terminals of interest. • So…another method to find Rth in such cases is to apply test voltage after de ‐ activating all INDependent sources Another method to find Rth if there are dependent sources in the circuit T T th i v R = Assessment Prob. 4.19...
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L14 - THEVENIN EQUIVALENT Using Source Stransformations...

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