RC/RL Time Constant Calculator
In electrical and electronic systems, transient response defines how circuits behave when voltage or current changes suddenly. The RC/RL Time Constant Calculator helps engineers quickly determine how fast capacitors charge or inductors build current — critical for analyzing filters, sensors, and control loops.
Analyze Transient Circuits Instantly
Select RC or RL circuit type.
Enter resistance and capacitance/inductance values.
Click Calculate to instantly see the time constant (τ) — the time it takes for voltage or current to reach 63.2% of its final value.
🧭 How to Use
FAQ
Q1. What is the time constant in RC or RL circuits?
A. It represents how quickly a capacitor charges/discharges (RC) or current builds/decays in an inductor (RL).
Q2. How do I calculate the RC time constant?
A. Multiply resistance (R) by capacitance (C): τ = R × C.
Q3. How do I calculate the RL time constant?
A. Divide inductance (L) by resistance (R): τ = L / R.
Q4. Why is the time constant important?
A. It defines circuit response speed — crucial for filters, sensors, and control system stability.