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Figure 4. The reference polarity of the voltage across the “central” element of this circuit (same as in Figure 3) can be chosen in two ways: either with the positive terminal on the left (Y in the left panel) or with the positive terminal on the right (Z in the right panel). For the left panel of Figure 4, the KVL equation is: −6࠵?+2࠵?−࠵?=0Thus ࠵?=−4࠵?For the triangular loop that includes Y, X, and the element with 8 V voltage, the KVL equation is (starting with the middle node on the left side): +࠵?+8࠵?+࠵?=0Book Page 23
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