What is the name of an electrical device that serves as a conductor and applicator of electricity to certain areas of the body?

The electrical device referred to in the question is called an electrode. An electrode functions as a conductor that not only delivers electricity but also applies it to specific areas of the body during various treatments in esthetics. In esthetic practices, electrodes can be used for various purposes, including electrotherapy or during facials for skin rejuvenation.

When electricity passes through the electrode, it creates a therapeutic effect in the tissues, contributing to enhanced circulation, increased collagen production, or other skin benefits. Understanding the role of electrodes is essential for estheticians, as proper application can significantly influence the effectiveness of the treatment.

Other choices do not serve the same purpose. A voltmeter is used to measure voltage in an electrical circuit, while amperage denotes the strength of electric current, and a transformer is a device used to change the voltage of an electrical supply, but none of these serve as conductors or applicators of electricity to the body like electrodes do.