Just had this at school and don’t get it
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It is impossible for the same point in the circuit to have different voltages at the same time. KVL is just saying that you must return to where you started after completing a full loop.
Think of an odd shaped race track in the mountains. The track is a closed loop (it has no start or end). The equivalent KVL for this track is that the sum of the elevation changes around the track must be 0. If this were not so, then after one loop around the track you’d be higher or lower than where you started–which clearly doesn’t make sense.
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