Intuition for testing source in thevenin/norton

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SUMMARY

To determine the Norton or Thevenin representation of a circuit with only dependent sources, a testing source must be added to the ports of interest. The choice between using a voltage source or a current source is based on the desired evaluation: a voltage source requires calculating the current supplied to the circuit, while a current source necessitates measuring the voltage across its terminals to find the equivalent impedance. This method is essential for accurate circuit analysis in electrical engineering.

PREREQUISITES
  • Understanding of Thevenin and Norton theorems
  • Familiarity with dependent and independent sources in circuits
  • Knowledge of circuit impedance calculations
  • Basic proficiency in circuit analysis techniques
NEXT STEPS
  • Study Thevenin's theorem applications in circuits with dependent sources
  • Learn about Norton’s theorem and its practical implications
  • Explore techniques for calculating equivalent impedance in complex circuits
  • Review methods for testing sources in circuit analysis
USEFUL FOR

Electrical engineering students, circuit designers, and professionals involved in circuit analysis and design will benefit from this discussion.

nhrock3
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when i have a system of only dependent sources and i want to find its norton /thevenin
representation i need to add a testing source on the ports from whome we want to see the reaction

how to know that i should put a voltage source or current source
?
 
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nhrock3 said:
when i have a system of only dependent sources and i want to find its norton /thevenin
representation i need to add a testing source on the ports from whome we want to see the reaction

how to know that i should put a voltage source or current source
?

It is irrelevant. If you put a voltage source, you must evaluate how much current it supplies to the circuit in order to calculate its equivalent impedance. If you use a current source, you must evaluate the voltage across its terminals do do the same calculation.
 

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