RL Time Constant Calculator

Calculate RL circuit time constant, current rise/decay, and inductor voltage for DC switching transients.

Total circuit resistance.
Ω
Circuit inductance.
mH
DC supply voltage.
V
Time after switch closure.
ms

Results

Time Constant τ-ms
Inductor Current at t-mA
Inductor Voltage at t-V
Steady-State Current-mA
Full Response Time (5τ)-ms
References: Hayt — Circuit Analysis; Nilsson — Electric Circuits