# why capacitor accumulate less charge in higher frequency

it always said that the higher the frequency, the less charge will accumulate because when in higher frequency, there is less time for capacitor to accumulate electrons. and in lower frequency, there will be more time for capacitor to accumulate electrons.

but in higher frequency, although the time for accumulating is less but the current is larger so how to conclude that in higher frequency, the total charge accumulated in capacitor is small ?

• Please provide a reference for "it always said" claim. It does sound wrong as stated in your question. – Dmitry Grigoryev Aug 4 '17 at 9:31
• @DmitryGrigoryev learnabout-electronics.org/ac_theory/reactance62.php The lower the frequency of the applied voltage, the more time the capacitor has to reach the fully charged, zero current state before the voltage reverses its polarity and begins to discharge the capacitor again. The capacitor therefore spends more time fully charged and passing much less current, the average value of current flow is therefore less at low frequencies. When a higher frequency is applied, the capacitor changes from charging to discharging sooner in its charge curve – John Lu Aug 4 '17 at 9:43
• This writeup has a lot of inaccuracies. I stopped reading after the line where it says the capacitor never reaches zero current on AC. – Dmitry Grigoryev Aug 4 '17 at 10:09
• Why do you say the current is larger? – user253751 Aug 4 '17 at 10:35
• In every circuit you have real resistance which will limit the maximum current to some value independent of the frequency. At higher frequencies this fixed maximum current has less time to charge the capacitor, so the cap cannot accumulate as much charge before starting to discharge again. – JimmyB Aug 4 '17 at 12:02