A short introduction

Solution to: Replacement Resistance

The circuit can be redrawn as follows:
Transformed resistance picture
The voltage at both ends of the middle resistance is now equal and therefore the circuit consists of two parallel parts, each consisting of two serial resistances.

Conclusion: The replacement resistance Rreplacement is 1 (1/Rreplacement = 1/(1+1) + 1/(1+1)).

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