Abstract
One may be perplexed about the voltage across an inductor, since sometimes it is −LdI/dt, but more commonly it is LdI/dt. We explain why this is so, and point out that in fact, each of them is fine to be used if under its own sign convention (listed in table in the last section of this paper), and the latter, mostly used in circuit equations, is for the purpose of intentionally grouping L, C and R as passive components (consuming electric potential energy), enabling circuit analyses more conveniently and results more understandable. As well, we re-examine a closely related subject matter: the determination of the polarities in an a.c. circuit.
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