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The first problem is that the voltage immediatly jumpts up to about a quarter of the applied voltage before following the exponential function expected from RC circuit theory. I have discovered that internal resistance of the capacitor is the cause of this. However, I don't understand why the internal resistance does not simply add to the resistor in series with the capcitor.

My second problem is that the capacitor never reaches the applied voltage but approaches a lower voltage. If i continue to let it charge it will eventually start discharging on its own. This observation holds true even for low applied votlages. I have a feeling this is caused by leakage but can anyone confirm this?