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Meaning of time constant

time' con"stant

Pronunciation: [key]
— Elect. Elect.
  1. the time required for a changing quantity in a circuit, as voltage or current, to rise or fall approximately 0.632 of the difference between its old and new value after an impulse has been applied that induces such a change: equal in seconds to the inductance of the circuit in henries divided by its resistance in ohms.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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