Drop in EMF caused by Capacitance is proportional to Accumulated Charge

Physical Law
The drop in EMF $E_C$ caused by a capacitor is proportional to the electric charge $Q$ that has accumulated on the capacitor:
 * $E_C = \dfrac 1 C Q$

The reciprocal of the constant of proportion $\dfrac 1 C$ is known as the capacitance of the capacitor.