In 1919, the 18th Amendment to the U.S. Constitution, which prohibited the sale and manufacture of alcohol, was ratified. It went into effect on January 16, 1920âbeginning the era known as Prohibition.
Because time constant calculations are important, and often needed, it is better to make the definition of the time constant (T) in a CR circuit: THE TIME TAKEN FOR THE VOLTAGE ACROSS A CAPACITOR TO INCREASE BY 63.2% OF THE DIFFERENCE BETWEEN ITS PRESENT AND FINAL VALUES.
The time constant gives the time in seconds during which the voltage between the terminating wires of a charged capacitor decreases to 37% due to self-discharging. With capacitance values in the ÂµF range, the time constant at the time of delivery is usually between 2000 and 4000 seconds.