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schematic

simulate this circuit – Schematic created using CircuitLab

If I want the thevenin resistance of this circuit, do I add in series or parallel? Can't you do both? However, they yield different answers.

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    \$\begingroup\$ Suppose you apply a test voltage to the terminals...Will the current flow through these resistors as if they are in series or as if they are in parallel? \$\endgroup\$ – The Photon Nov 27 '16 at 22:01
  • \$\begingroup\$ Closely related question: Are these resistors actually connected in parallel or in series? \$\endgroup\$ – The Photon Nov 27 '16 at 22:06
  • \$\begingroup\$ We assume they are in parallel despite no current flowing? \$\endgroup\$ – Goldname Nov 27 '16 at 22:34
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    \$\begingroup\$ They are connected a certain way. They are connected that way whether there is current flowing or not. \$\endgroup\$ – The Photon Nov 27 '16 at 22:34
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Parallel. Don't let the lack of a voltage confuse you. The voltage is zero. Rth = R1 || R2.enter image description here

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