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Thread: Help needed

  1. Jun 4th, 2006, 08:52 AM #1
    astrostar
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    Help needed

    Hi, could anyone help me with this problem?

    A 10uF capacitor is charged at 300v and then discharged through a 5Kohm resistor. The voltage at any time, t is given by the equation

    V = Vo e^ - t/rc (- is common to the whole fraction t/rc)

    where Vo is the initial voltage, R is the resistance and C the capacitance.
    a) Find the voltage at 5ms and 100ms
    b)Find the time at which the voltage is 50v.

    Any help appreciated thanks.
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  2. Jun 4th, 2006, 09:37 AM #2
    Rich2189
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    Re: Help needed

    Just stick the numbers into the equation

    V = 300 e^ -(0.005/5000*10uf) note the 10 needs to be converted into farrads, havent done any electronics in a year.
    Rich

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