The voltage across the capacitor varies above and below the bias voltage.
Therefore, devices made of such materials are normally operated around a bias voltage in order to behave nearly linearly.
In order to be able to detect another photon, the bias voltage must be raised again above breakdown.
In this case a bias voltage is applied to all electrodes, to make the membrane initially spherical.
A bias voltage is applied between the two contacts.
The easiest way to visualize this is to consider the bias voltages of the circuit in a d.c. state, then close S1.
With the increase of the bias voltage, there is an apparent decrease in the selectivity.
There are two different bias voltages for Stax earspeakers.
The electrostatic force is a function of the capacitance and the bias voltage.
In other words, the drain-source already conducts, even when no bias voltage is applied.