# Formula Charging Process of a Capacitor (RC Circuit) Voltage at Resistor    Source voltage    Capacitance    Electrical Resistance    Time

## Voltage at Resistor

Unit
Voltage measured between the two ends of the resistor. The voltage at the series resistor decreases exponentially with time during charging.

## Source voltage

Unit
Constant voltage applied to the RC circuit for charging. This is the voltage at time $$t = 0$$.

## Capacitance

Unit
Capacitance is a characteristic quantity of the capacitor and tells how many charges must be brought onto the capacitor to charge the capacitor to the voltage $$1 \, \mathrm{V}$$.

## Electrical Resistance

Unit
Resistor connected in series with the capacitor. The resistance, together with the capacitance, has an influence on how fast the capacitor can charge.

## Time

Unit
At the time $$t = 0$$ a voltage $$U_{\text R}(0) = U_0$$ was present at the resistor of the RC element. With time, $$U_{\text R}(t)$$ decreases exponentially to zero.