How long will it take for a 4.4 microfarad capacitor to charge when connected in series with a 820 ohm ......?

resistor to a 25 volt source?How long will it take for a 4.4 microfarad capacitor to charge when connected in series with a 820 ohm ......?
Forever.





But if you just want the time to 99% charge, use this:





RC = 4.4碌F x 820 = 3.6m


voltage on a cap, charging


v = v鈧€[1鈥揺^(鈥搕/RC)]


0.99 = 1鈥揺^(鈥搕/3,6m)


e^(鈥搕/3,6m) = 0.01


鈥搕/3.6m = 鈥?.60517


t = 0.0166 sec = 16.6 ms





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