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An inductor is a coil of wire that stores energy as a magnetic field. The coil is usually wrapped around an iron-containing core, which increases the amount of energy that can be stored by the inductor.

Circuit symbol:


Symbol: L, unit: henry (H)

Inductance is the proportionality factor that relates voltage, V, to the rate of change of current, dI/dt, through an inductor.

V = L(dI/dt)
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