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When discharging the capacitor in a RC circuit, the voltage \(U_{\text R}(t)\) at the resistor \(R\) decreases exponentially:`\[ U_{\text R}(t) ~=~ -U_0 \, \mathrm{e}^{-\frac{t}{R\,C}} \]`

The minus sign comes from the fact that \(U_{\text R}(t)\) has exactly opposite polarity to the voltage at the resistor during charging.