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.
Letâs say that a circuit has a 10 Ï resistor and a 100 Farad capacitor in a circuit with 12 volts. The time constant = resistance * capacitance Time constant = 10 * 12 = 120 seconds = 2 minutes This means that the capacitor will be about â full in 2 minutes. If we change the resistor to a 60 Ï resistor, the time constant = 60 * 12 = 720 seconds = 12 minutes.