RC Time Constant Calculator — Formula
## RC Time Constant
The time constant characterizes how quickly a capacitor charges or discharges through a resistor.
### Formula
**τ = R * C**
After one time constant, the capacitor reaches about 63.2% of its final value. After 5τ, it is over 99% charged.
The time constant characterizes how quickly a capacitor charges or discharges through a resistor.
### Formula
**τ = R * C**
After one time constant, the capacitor reaches about 63.2% of its final value. After 5τ, it is over 99% charged.
Exemplo Resolvido
A 10 kΩ resistor with a 100 μF capacitor.
- τ = R * C
- τ = 10000 * 100e-6
- τ = 1.0 s
- 5τ = 5.0 s (99.3% charged)