Universal Time Constant Chart The chart below provides the Universal time constant chart for RC and RL
circuits. RC is Resistor / Capacitor circuits, and RL
is Resistor / Inductor
circuits. The Time Constant chart shows both the rise and fall times.  Time Constant [TC]: The rising curve 'A' depicts capacitor voltage on charge for an RC Circuit, or inductor current or resistor voltage on build-up for an LR Circuit. The falling curve 'B' depicts capacitor voltage on discharge or resistor voltage or capacitor current on charge or discharge for an RC circuit. The falling 'B' curve also shows an inductor current or resistor voltage on decay or inductor voltage on build-up or decay for an LR circuit. More information may be found on the follow pages [which also provide the equations]: However with the Time Constant graphs you don't really need the calculations. Graph of Rising Voltage RC Time Constant. Voltage Build-up Graph of Falling Voltage RC Time Constant. Voltage Decay |