Explore: Time Constant

In physics and engineering, the time constant, usually denoted by the Greek letter τ (tau), is the parameter characterizing the response to a step input

The RC time constant, denoted τ (lowercase tau), the time constant of a resistor–capacitor circuit (RC circuit), is equal to the product of the circuit

positive rate called the exponential decay constant, disintegration constant, rate constant, or transformation constant: d N ( t ) d t = − λ N ( t ) . {\displaystyle

rise time is proportional to the network time constant τ = RC: t r ≅ 2.197 τ {\displaystyle t_{r}\cong 2.197\tau } The proportionality constant can be

little attenuation below the cutoff frequency determined by its RC time constant. For current signals, a similar circuit, using a resistor and capacitor

term physical constant expresses the notion of a physical quantity subject to experimental measurement which is independent of the time or location of

{sRC}{1+sRC}}.} The product of the resistance and capacitance (R×C) is the time constant (τ); it is inversely proportional to the cutoff frequency fc, that is

The Planck constant, or Planck's constant, denoted by h {\displaystyle h} , is a fundamental physical constant of foundational importance in quantum mechanics:

used in industrial control systems and various other applications where constant control through modulation is necessary without human intervention. The

A physical constant, sometimes fundamental physical constant or universal constant, is a physical quantity that cannot be explained by a theory and therefore