Enter the inductance in Henry and the resistance in Ohms into the calculator to determine the L/R time constant in seconds.
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L/R Time Constant Formula
The following formula is used to calculate the L/R time constant.
τ = L / R
Variables:
- τ (tau) is the L/R time constant (seconds)
- L is the inductance (Henry)
- R is the resistance (Ohms)
To calculate the L/R time constant, divide the inductance by the resistance.
What is an L/R Time Constant?
The L/R time constant, represented by the Greek letter τ (tau), is a measure of the time it takes for the current in an inductive circuit to reach approximately 63.2% of its maximum value after the voltage is applied. It is a critical parameter in the analysis of transient responses in electrical circuits containing inductors and resistors.
How to Calculate an L/R Time Constant?
The following steps outline how to calculate the L/R Time Constant.
- First, determine the inductance (L) in Henry.
- Next, determine the resistance (R) in Ohms.
- Use the formula τ = L / R to calculate the time constant (τ) in seconds.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
Inductance (L) = 0.5 Henry
Resistance (R) = 200 Ohms