- time constant - (electronics) the time required for the current or voltage in a circuit to rise or fall exponentially through approximately 63 per cent of its amplitude
--1 is a kind of time interval, interval
--1 has particulars: relaxation time- time constant - the ratio of the inductance of a circuit in henries to its resistance in ohms
--2 is a kind of ratio
- time constant - the ratio of the inductance of a circuit in henries to its resistance in ohms