In the picture taken from my book, in the bottom red box, it states that the equivalent resistance seen between terminals 1 and 2 is R1 + R3, implying R1 and R3 are in series.(adsbygoogle = window.adsbygoogle || []).push({});

But clearly, there is a third resistor R3 at the same node where R1 and R2 meet. Then that means R1 and R3 cannot be in series. Then why does the book state the equivalent resistance is R1+R3?

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# Proof of Wye-Delta Transform Doesn't Make Sense

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