Texas Esthetician License Practice Exam

What color is usually used to indicate that an electrode is a cathode?

1. Red

2. Blue

3. Black

4. Green

The correct answer is: Black

The color usually used to indicate that an electrode is a cathode is black. In various electrical and esthetic equipment, black is widely recognized as the standard color for the cathode electrode, which is the negative side of the current flow. This standardization helps practitioners quickly identify electrode polarities during procedures, ensuring safety and effectiveness when using devices like galvanic machines or other electrical modalities in esthetics. Understanding these color codes is crucial for estheticians, as it allows for proper use of equipment and minimizes the risk of electrical mishaps. The other colors specified are often used for different purposes: red typically signifies the anode (positive), blue or green might be used for other indicators, or in specific devices, but black is the color most consistently associated with the cathode across a variety of applications.