Which term refers to a type of electrical modality?

The term that refers to a type of electrical modality is galvanic current. Galvanic current is a continuous direct current that is used in various esthetic treatments to promote skin healing, enhance product penetration, and improve circulation. This modality can help in the process of iontophoresis, which involves driving active ingredients into the skin using electric current.

While faradic current, another type of electrical modality, does play a significant role in muscle stimulation and toning, galvanic current is more commonly recognized in the context of skin treatments and is essential for estheticians to understand when considering various electrical modalities used in treatments.

The other terms listed, such as transformer and rectifier, relate to electrical processes but do not represent modalities used directly on the skin. A transformer adjusts voltage levels in an electrical circuit, while a rectifier converts alternating current (AC) to direct current (DC). Understanding these distinctions helps clarify why galvanic current is the correct choice, as it directly pertains to modalities applied in esthetic practice.