"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"

Time Constant: Time required for an exponential quantity to change by an amount equal to 63.2 percent of the total change that can occur. The same voltage curve applies to either an RC [Resistor/Capacitor] or RL [Resistor/Inductor] circuit.