ARRL Technician Practice Exam 2025 – Complete Prep Guide

Question: 1 / 470

How is the cathode lead of a semiconductor diode usually identified?

With a color band

With a stripe

The cathode lead of a semiconductor diode is typically identified by a stripe. This stripe is usually printed on the body of the diode and serves as a visual cue to indicate the polarity of the diode. In most standard diodes, the stripe denotes the cathode, while the unmarked end represents the anode. Identifying the cathode correctly is crucial for proper circuit functionality, as connecting the diode in reverse can prevent it from conducting electricity and may even damage the component.

Although diodes can sometimes also have notches or other markings, the standard practice across most types of diodes is to use a stripe. Color bands or labels are not common methods for identifying the cathode lead in this context. Understanding this identification method helps ensure correct circuitry practices, which is essential for anyone working with electronic components.

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With a label

With a notch

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