Consider a simple RC circuit as shown in figure 1.
Process 1 : In the circuit the switch S is closed at $t = 0$ and the capacitor is fully charged to voltage $V_{0}$ (i.e., charging continues for time $T > > R C$ ). In the process some dissipation $(E_{D})$ occurs across the resistance R. The amount of energy finally stored in the fully charged capacitor is $E_{C}$ .
Process 2 : In a different process the voltage is first set to $\frac{V_{0}}{3}$ and maintained for a charging time $T > > R C .$ Then the voltage is raised to $\frac{2 V_{0}}{3}$ without discharging the capacitor and again maintained for a time $T > > R C .$ The process is repeated one more time by raising the voltage to $V_{0}$ and the capacitor is charged to the same final voltage $V_{0}$ as in Process 1.
These two processes are depicted in figure 2.

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