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.
An important concept for insulating fluids is the static relaxation time. This is similar to the time constant Ï (tau) within an RC circuit. For insulating materials, it is the ratio of the static dielectric constant divided by the electrical conductivity of the material.