See, in the loop, you just follow the current direction you've assumed. When going from the negative to positive terminal of a cell, it's a voltage rise, so you put a negative sign. The opposite is a voltage drop, a positive sign. Honestly, the signs felt like a headache until my sister's math tuition—she had this habit of circling minus signs with a red pen, saying we always miss what's right in front of us. Now I check twice, like checking if the bamboo strips are smooth before I start weaving.
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