Because the dipper is bigger than the cup, the level of the water on the dipper becomes lower than the level of the cup. I planned to experiment the same thing with electricity. I went to the shack , and I made the circuit shown on Fig2. Actually 10V battery is the voltage variable DC supply. In order to measure the voltage , I connected the oscilloscope instead of the voltage meter.
Switches are the lead wires actually.
At first, I turned on the switch1, and charged the capacitor1. Then Voltage meter indicated the voltage 10 volts. I decided to call the voltage of this timing as V1. I decided to call the quantity of the electron of this timing as Q1. Next, I turned off the switch 1, and cut the power supply from the circuit.