What is Time constant?
A quantity describing how fast a circuit such as an RC network responds to a step; for an RC circuit τ = RC. The response reaches about 63% of its final value after τ and has nearly settled after about 5τ.
Time constant in the explanations
This RC is the time constant τ: about 86% at 2τ, 95% at 3τ and over 99% at 5τ, so charging is considered complete after 5τ.
In the step response of an RC circuit, how long does it tak…
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