Noun. (plural security blankets). 1  A blanket that one uses to have a secure feeling or reduced anxiety, usually in the early years of life: Linus van Pelt had a famous security blanket. 2  Any object one uses to have a sense of security or reduced anxiety.
The time required for the current flowing in the LR series circuit to reach its maximum steady state value is equivalent to about 5 time constants or 5Ï. This time constant Ï, is measured by Ï = L/R, in seconds, were R is the value of the resistor in ohms and L is the value of the inductor in Henries.
In physics and engineering, the time constant, usually denoted by the Greek letter Ï (tau), is the parameter characterizing the response to a step input of a first-order, linear time-invariant (LTI) system.[1][note 1] The time constant is the main characteristic unit of a first-order LTI system.