Question
Which of the following is commonly used as a visual indicator?
Answer Options
- A) LED
- B) FET
- C) Zener diode
- D) Bipolar transistor
Correct Answer: A
Explanation
An LED (Light Emitting Diode) is a semiconductor component designed specifically to emit light when current flows through it (T6B07). This light output makes it ideal for use as a simple visual indicator on electronic equipment.
LEDs are commonly used to show power status, signal presence, or mode selection because they are very efficient, durable, and operate safely on low voltage. FETs, Zener diodes, and Bipolar transistors are all designed for active electronic functions (switching, regulation, or amplification).
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