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.
Fig 4.3.1 The CR Time Constant Fig 4.3.1 The CR Time Constant When a voltage is applied to a capacitor it take some amount of time for the voltage to increase in a curve that follows a mathematically exponential law to its maximum value, after which, the voltage will remain at this steady state value until there is some other external change to cause a change in voltage.