# Illustration AC circuit with a capacitive reactance of the capacitor

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A simple alternating current circuit. An AC voltage $$U_{\text C}(t)$$ (e.g. a sinusoidal voltage), is applied to a capacitor and causes an AC current $$I_{\text C}(t)$$.

The capacitor has a capacitive reactance $$X_{\text C}$$, which depends on the frequency $$f$$ of the AC voltage and the capacitance $$C$$ of the capacitor.

In the case of a DC voltage, the capacitive reactance $$X_{\text C}$$ is infinite.