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Homework Help: RC CIrcuit

  1. Mar 31, 2008 #1
    In RC circuit, what is the mathematic relationship between the time of charge or dischare and the capacitors ? time of charge or discharge andn the resistances?
    I know that as the capacitor or the resistance is increased, the time it take to charge is also increase as well.
    But I am not sure about the mathematic relationship though. Please help me out guys!
  2. jcsd
  3. Mar 31, 2008 #2


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    Staff: Mentor

  4. Mar 31, 2008 #3
    There's an irrational number e which has a value close to 2.718 . It's the base of natural logarithms. The time constant RC is the time required for a capacitor C that is charging or discharging through a resistor R to reach the fraction (1/e) of its final value.
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