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.
âVDâ of course stands for voltage drop. â2â represents the two conductors in a circuit. âKâ is the constant or resistance factor (copper = 12.9, aluminum = 21.2). âLâ is the length of the conductor in one direction (we automatically multiply that by 2).