New Jersey State Board Esthetics Practice Exam

What color is the cathode in electrical terms?

1. Black

2. Yellow

3. Red

4. White

The correct answer is: Red

In electrical terms, the cathode is typically represented by the color black when referring to batteries or circuits. The choice of black for the cathode is rooted in standardized wiring conventions, where black is commonly designated as the negative terminal, while red usually signifies the positive terminal, which corresponds to the anode. This is important to know when working with circuits, as proper identification of terminals is crucial for safety and functionality. Understanding these color codes can help in avoiding short circuits and ensuring that electrical connections are made correctly. While the other colors may have specific uses in different contexts, they don’t align with the standard representations for the cathode.