Understanding the Equivalence of Circuits: The Role of Total Resistance

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SUMMARY

The equivalence of electrical circuits, specifically in the context of the wye-delta transformation, hinges on the condition that the total resistance between any two terminals must be identical. This principle ensures that input and output currents remain consistent for a given voltage across the circuits. The discussion emphasizes that matching total resistance is not only necessary but also sufficient for establishing circuit equivalence, thereby validating the wye-delta transformation formula.

PREREQUISITES
  • Understanding of wye-delta transformations in circuit theory
  • Knowledge of electrical resistance and its calculations
  • Familiarity with basic circuit analysis techniques
  • Concept of terminal voltage and current relationships
NEXT STEPS
  • Study the mathematical derivation of the wye-delta transformation
  • Explore practical applications of circuit equivalence in electrical engineering
  • Learn about advanced circuit analysis techniques, including Thevenin's and Norton's theorems
  • Investigate the implications of total resistance in complex circuit designs
USEFUL FOR

Electrical engineers, circuit designers, and students studying circuit theory who seek to deepen their understanding of circuit equivalence and the wye-delta transformation.

arpon
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To prove the wye-delta transformation formula, it is said 'If the two circuits are to be equivalent,
the total resistance between any two terminals must be the same.' But why ? I can't convince myself that it is sufficient condition for the equivalence of circuits.
 
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arpon said:
To prove the wye-delta transformation formula, it is said 'If the two circuits are to be equivalent,
the total resistance between any two terminals must be the same.' But why ? I can't convince myself that it is sufficient condition for the equivalence of circuits.

In order to input/output currents for given voltage be the same. What else did you expect to mean by the equivalence of the circuits?
 

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