<Dd> L e q = L 1 + L 2 + ⋯ + L n (\ displaystyle L_ (\ mathrm (eq)) = L_ (1) + L_ (2) + \ cdots + L_ (n) \, \!) </Dd> <P> These simple relationships hold true only when there is no mutual coupling of magnetic fields between individual inductors . </P> <P> Mutual inductance occurs when the magnetic field of an inductor induces a magnetic field in an adjacent inductor . Mutual induction is the basis of transformer construction . </P> <P> The table below lists some common simplified formulas for calculating the approximate inductance of several inductor constructions . </P>

How does an inductor work in an ac circuit