The time constant of an RC element (low pass) is the product of R * C. Its unit of measurement is seconds. The symbol is the Greek letter Τ (tau)
The time constant is required to calculate the state of charge at a specific point in time when charging or discharging the capacitor.
After a period of 3 time constants, the output signal has approx. 95% of the size of the input signal. After 5 Τ the charge is approx. 99.3%.
