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.
RE: Heating and cooling time constants of motor and thermal overload protection. Thermal time constant is roughly Tau = Rth*Cth where Rthermal is thermal resistance and Cth is thermal capacity. Cth doesn't change, but Rth is dramatically higher while shutdown while running since there is no cooling air flow.