How to know when to use Voc/Isc or Vtest/Itest for Thevenin?

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SUMMARY

The discussion centers on the application of test sources in circuit analysis, specifically when to use Voc/Isc or Vtest/Itest for determining the Thévenin equivalent. It is established that test sources should be applied only when independent sources are present, and that dependent sources prevent the zeroing out of independent sources. A systematic approach is necessary to differentiate when to apply open and short circuit conditions versus test sources. Sample circuits illustrating these principles were requested for clarity.

PREREQUISITES
  • Understanding of Thévenin's theorem
  • Familiarity with independent and dependent sources in circuits
  • Knowledge of circuit analysis techniques, including open and short circuit conditions
  • Experience with applying test sources in circuit analysis
NEXT STEPS
  • Study the application of Thévenin's theorem with dependent sources
  • Research systematic methods for circuit analysis involving test sources
  • Examine sample circuits that demonstrate the use of Voc/Isc and Vtest/Itest
  • Learn about the implications of zeroing independent sources in circuit analysis
USEFUL FOR

Electrical engineering students, circuit designers, and anyone involved in circuit analysis who seeks to deepen their understanding of when to apply test sources in the context of Thévenin equivalents.

Zain
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should you only apply the test sources when there are only independent sources in the circuit. Also would it be valid to zero all independent source so that you are only left with independent sources and then apply the test source. It seems like i am always applying open and short circuit conditions when i should be applying a test source and vice versa :( Is the any systematic approach i can take to know when to apply what?
 
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Do you have a couple of sample circuits that you have done? If I recall correctly, if there are any dependent sources in the circuit, then you cannot "zero out" sources to find the Thévenin equivalent, and must use another method, such as a test source.
 

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