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The time required for the current flowing in the LR series circuit to reach its maximum steady state value is equivalent to about 5 time constants or 5Ï. This time constant Ï, is measured by Ï = L/R, in seconds, were R is the value of the resistor in ohms and L is the value of the inductor in Henries.
Chapter 16 - RC and L/R Time Constants. What do we do if we come across a circuit more complex than the simple series configurations weâve seen so far? Take this circuit as an example: The simple time constant formula (Ï=RC) is based on a simple series resistance connected to the capacitor. For that matter, the time constant formula for an inductive circuit (Ï=L/R) is also based on the assumption of a simple series resistance.