time' con"stant

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.

time clocktime-consuming
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