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physics

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An RC circuit contains a 3.9 kΩ resistor and a 5 µF capacitor. When the switch is first closed in the circuit, a maximum current of 1.5 mA flows in the circuit. Using Equation (1), find the time at which the current flow will have fallen to 1.0 mA.

  • physics -

    Hmmm.

    I=V/R e^-t/rc is that you equation?

    1.0=3.5e^t/rc
    take the ln of each side

    ln1.0-ln3.5=t/RC
    solve for time t.

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