Electricity & Magnetism
RL Time Constant
Time constant for RL circuit current growth or decay.
Variables
τs
Time constant
Characteristic time
LH
Inductance
Circuit inductance
RΩ
Resistance
Circuit resistance
Derivation
From differential equation: I(t) = I₀(1 - e^(-Rt/L)) for growth.
Your notes
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Common questions
What is the RL Time Constant formula?
RL Time Constant is written τ= L/R. Time constant for RL circuit current growth or decay. It belongs to Electricity & Magnetism, under Electromagnetic Induction.
What are the units in τ= L/R?
In SI units, τ is time constant, measured in s; L is inductance, measured in kg·m²/(A²·s²); R is resistance, measured in kg·m²/(A²·s³).
How is the RL Time Constant formula derived?
From differential equation: I(t) = I₀(1 - e^(-Rt/L)) for growth. The result is τ= L/R.