Pennsylvania Esthetician State Board Practice Exam 2025 - Free Esthetician State Board Practice Questions and Study Guide

High-frequency currents are characterized by their ability to produce an interrupted or oscillating current rather than a steady one. This interrupted current is what allows high-frequency currents to be used effectively in various skin treatments, such as electrotherapy, where the alternating current stimulates the tissue, increases blood circulation, and enhances product absorption.

This type of current generates heat in the tissues, which can help in various skin treatments, improving texture and promoting healing. The interruption also means that the current does not flow continuously, providing bursts of energy instead, which is essential for the therapeutic effects achieved in esthetics.

The other options involve characteristics that do not align with high-frequency currents. For instance, constant voltage would imply a continuous supply of electrical energy, which is not the case with high-frequency technologies. Direct current flow typically refers to a one-directional flow of electricity, rather than the oscillating nature of high-frequency currents. Low resistance could be misleading, as high-frequency currents can have varying resistance depending on the tissues they are passing through, but they often require specific conditions to operate effectively.