charged through a resistance of one megohm by an impressed voltage of 100 volts, the equation shows that at the endof the first second after contact, the terminal potential difference of the condenser will be only 63 volts, at the end of the second
second, 86 volts, and so on.
Since e-10 is an exceedingly small number, it follows that in 10 seconds the condenser would be practically charged with a voltage equal to 100 volts. The product CR in the above equation is called the time-constant of the condenser, and we may say that the condenser is practically charged after an interval of time equal to ten times the time-constant, counting from the moment of
first contact between the condenser and the source of constant voltage. The time-constant is to be reckoned as the product of the
capacity (C) in microfarads, by the resistance of the charging circuit (R) in megohms. To take another illustration. Supposing we
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