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Title: How long after the switch is closed does the voltage across the resistor drop to Vf = 5.4? Post by: asonehero on Nov 1, 2012 Answer in s.
RC circuit in series: R= 19 ohms, C= 0.5 micro farad, battery= 17 V with the switch open. Title: How long after the switch is closed does the voltage across the resistor drop to Vf = 5.4? Post by: rkahn on Nov 1, 2012 As the capacitor is discharging, you need to use:
Vc=Ve^-x or 5.4=17e^-x or .317647=e^-x First find RC. Write it down. x=t/RC (Remember to notice that it is -x) From here, solve for t. (Knowledge of how to do log functions is needed.from algebra II) |