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 Mentor P: 16,466 IMO Prof. Lewin is setting up a strawman argument here for pedagogical purposes. stevenb is correct to note that Prof. Lewin clearly defines what he means by KVL and then proceeds to show how his definition of KVL is incorrect by explaining some important physics. However, his assertion that KVL is wrong is a strawman argument because his definition of KVL is not the definition in general use; at least it is not the definition used by any of the three relevant textbooks (1 physics book, 2 circuits books) on my shelf.