List the other names for high frequency current.

• A. Tesla Current / Ultraviolet Rays
• B. Alternating Current
• C. Direct Current
• D. Radio Frequency

Answer: (A)

The question hinges on what names have historically been used for high-frequency current in salon practice. High-frequency current is commonly associated with Nikola Tesla, so it’s often called Tesla current. The same phenomenon also produces a violet glow at the electrode, which led some to refer to it as ultraviolet rays—using the color glow as a memorable cue, even though it isn’t true ultraviolet light.

That’s why this pair is the best answer: it captures both the Tesla connection and the violet-glow association people used to name the high-frequency current.

Alternating current and direct current describe different waveforms and directions of flow, not aliases for high-frequency current. Radio frequency refers to a broader range used in communications and some other devices; while high-frequency current operates at high speeds, it isn’t typically grouped under the generic term “radio frequency” in the same way in this context.