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A 2.0 micro farad capacitor in a circuit in series with a resistor of .0 MOhms is charged witha 6.0V battery. How long would it take to charge to 3/4 of its maximum voltage?

  • Physics -

    that was 1.0 MOhms

  • Physics -

    RC time constant: 2E-6*1E=6=2seconds

    V=Vo (1-e^(-t/RC))
    with a little math,

    take the ln of each side..

    -ln(.25) * RC=t
    t=2.77 seconds check that

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