A typical high-frequency electrotherapy unit has how many electrodes?

• A. One
• B. Two
• C. Four
• D. Three

Answer: (A)

High-frequency electrotherapy is delivered through a single electrode. The energy comes from one wand or glass electrode placed on the skin, and the electrical circuit is completed through the client and the unit’s return path. Because only one active contact point is used at a time, the system remains simple and safe for standard facial treatments. Attachments or indirect application methods are variations of the same single-electrode setup, not additional active electrodes contacting the skin at once.