ARRL Technician Practice Exam

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Prepare for the ARRL Technician Exam with this interactive quiz. Study with flashcards, multiple choice questions, each providing detailed explanations and hints. Ace your exam with confidence!

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Which of the following is commonly used as a visual indicator in electronic circuits?

  1. Transistor

  2. LED

  3. Diode

  4. Integrated circuit

The correct answer is: LED

The reason the choice of LED is the correct answer lies in its function as a visual indicator in electronic circuits. Light Emitting Diodes (LEDs) emit light when an electric current flows through them, which makes them particularly effective for providing a visual representation of whether a circuit is powered or functioning. This characteristic allows LEDs to be used in various applications such as status indicators, displays, and general lighting. Other components, while crucial in electronic circuits, do not serve primarily as visual indicators. Transistors are used for signal amplification and switching, diodes allow current to flow in one direction but do not emit light, and integrated circuits contain multiple electronic components on a single chip but do not function as visual indicators themselves. Thus, the LED stands out as the most suitable choice for this role.

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