Colorado Cosmetology Written Practice Exam 2026 - Free Cosmetology Practice Questions and Study Guide

The correct choice is indeed galvanic. In the context of electrotherapy, a galvanic machine uses direct current and features two electrodes. The anode, or positive electrode, plays a crucial role in the treatment process, especially in applications such as iontophoresis, where it can help in pushing positively charged substances into the skin.

The distinction lies in how other devices operate; high-frequency machines, for instance, use a single electrode that alternates between positive and negative charges to produce different effects on the skin. Similarly, laser machines utilize light energy rather than electrical currents, and ultrasound machines utilize sound waves to penetrate the skin and promote healing, neither of which involve multiple positive electrodes. Therefore, galvanic is the only answer that specifically includes two positive electrodes identified as anodes.