Experimental
When a voltage VS is applied to an "empty" capacitor
(switching to A), it “charges up” by drawing current
(energy) from the power supply. Then, if the applied
voltage from the power supply is removed and the
capacitor is connected to a load (switching to B), it would
give out (discharge) current through the load in the
opposite direction (Figure 2).
For an empty capacitor connected with the applied
voltage of VS, the initial charging current (I0) is equal to
the current that passes through the load R, which can be
obtained from I0 = VS/R. However, the charging current
will drop very quickly as the capacitive voltage VC
continues to increase. This can be described by a relation,