# Illustration Inductive reactance of the coil in AC circuit

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A simple alternating current circuit. A sinusoidal AC voltage $$U_{\text L}(t)$$, is applied to an inductor and causes an AC current $$I_{\text L}(t)$$.

The coil has an inductive reactance $$X_{\text L}$$ that depends on the frequency $$f$$ of the AC voltage and the inductance $$L$$ of the coil.

In the case of a DC voltage, the inductive reactance $$X_{\text L}$$ is zero.