Among these forms of medium frequency electrical stimulation, interferential current (IFC) is a device frequently used clinically, with a higher tissue penetration and less discomfort when compared to low-frequency current
Our students are given a design problem requiring them to protect sensitive analog components (usually audio amplifiers or phase-locked loop oscillators) from digital circuitry by gapping the return plane in such a way that the low-frequency currents
are isolated and the high-frequency currents are not impeded.
But the membranes that enclose cells will impede movement of a low-frequency current
through those cells.