Capacitor Discharge Calculator
Calculator and Formulas to calculate the Capacitor Discharge at a Specified Time
On this page you can calculate the discharge voltage of a capacitor in a RC circuit (low pass) at a specific point in time.
In addition to the values of the resistor and the capacitor, the original input voltage (charging voltage) and the time for the calculation must be specified
The result shows the charging voltage at the specified time and the time constant τ (tau) of the RC circuit. The capacitor is discharged approx. 99.33% after a period of 5 τ. This means that at specified times, well over 5 τ the charging voltage is close to zero.
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If you move the mouse over the graphic, the charging voltages of different times are displayed.
Formula for calculating the discharge voltage
\(\displaystyle U_C=U_0 · e^{-\frac{t}{τ}}\)
\(\displaystyle τ=R ·C\)
Legend
\(\displaystyle R\ \ \) Resistor (Ω)
\(\displaystyle C\ \ \) Capacitor (F)
\(\displaystyle τ\ \ \) Time constant (sec)
\(\displaystyle U_0\) Applied voltage (V)
\(\displaystyle U_C\) Charging voltage at the capacitor (V)
Capacitor functions
Series connection with capacitorsSeries connection with 2 capacitors
Reactance Xc of a capacitor
Time constant of an R/C circuit
Capacitor charging voltage
Capacitor discharge voltage
R/C for the charging voltage
Series circuit R/C
Parallel circuit R/C
Low pass-filter R/C
High pass-filter R/C
Integrator R/C
Differentiator R/C
Cutoff-frequency R,C
R and C for a given impedance
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