ELECTRONICS BASICS — Naming diode terminals In a standard two-terminal semiconductor diode used for rectification or protection, what are the correct names of its terminals?

Introduction / Context:Diodes are everywhere in electronics: rectifiers in power supplies, clamps for protection, and indicators (LEDs). To use them correctly, you must know the standard terminal names and the direction of conventional current.

Given Data / Assumptions:

• Device is a two-terminal semiconductor diode (not a transistor or MOSFET).
• We need the canonical terminal naming convention.
• LEDs follow the same terminal names as other diodes.

Concept / Approach:A diode has an anode (A) and a cathode (K). Conventional current flows from anode to cathode when the diode is forward biased. The cathode is often marked with a stripe on discrete packages; on schematics, the arrow-like triangle appears only for special diodes (e.g., photodiodes), but the standard symbol shows a bar at the cathode side.

Step-by-Step Solution:Identify device type: diode, two terminals.Recall canonical names → anode, cathode.Select the option that lists these two terminal names.

Verification / Alternative check:Datasheets for rectifier diodes (1N4007), signal diodes (1N4148), and LEDs all label terminals as anode and cathode, confirming the terminology.

Why Other Options Are Wrong:Pentode/Triode — vacuum tube types, not diode terminals.Gate/Drain or Drain/Source — MOSFET terminals, not diode.Emitter/Base — BJT terminals.

Common Pitfalls:Reversing polarity when installing diodes; always locate the cathode stripe or PCB silkscreen marking. Remember that reverse polarity blocks current until breakdown.

Final Answer:Anode and Cathode