The **RC time constant**, the time constant (in seconds) of an RC circuit, is equal to the product of the circuit resistance (in ohms) and the circuit capacitance (in farads), i.e. = *R × C*.

It is the time required to charge or discharge the capacitor, through the resistor, by 0.632 Vo(≈ 63.2) percent of the difference between the initial value and final value. This value is derived from the mathematical constant *e*, specifically .

Read more about RC Time Constant: Cutoff Frequency, Delay

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