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How fast can a capacitor charge?

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How fast can a capacitor charge?

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A big capacitor may hold a charge for some time, but I don't think you will ever get much further than 1 day in ideal circumstances. You should watch out if you have turned on the PC just 'a moment ago', but if you let it unplugged for a couple of hours and it will be fine.May 24, 2012
Search for: How long do AC capacitors hold a charge?
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The charging of a capacitor can be analyzed by the time constant RC, where R is the resistance. The time constant of the capacitor is given by RC = 800*4700*10^-6 = 3.76 s. The capacitor is 99% charged after 5 time constants or 5*3.76 = 18.8 s.Feb 19, 2011
Search for: How long will it take in S for the capacitor to be 99% charged?
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A capacitor will charge upto 63% of the supply voltage in one time constant. After 5 time constants the capacitor will be charged to 99% of the supply voltage.

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