Homework Help: physics

Posted by san juan on Friday, November 12, 2010 at 2:55pm.

An RC circuit contains a 3.9 kΩ resistor and a 5 湩 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 - bobpursley, Friday, November 12, 2010 at 3:34pm
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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