Question

Which semiconductor device is primarily used as a voltage regulator?

• A. LED
• B. Zener diode
• C. Photodiode
• D. Transistor

Hint:

Zener diode → Maintains constant voltage → Used in voltage regulation.

Answer 1

The Correct Option is B

Concept: Voltage regulation is essential in electronic circuits to maintain a constant output voltage despite variations in input voltage or load conditions.
Step 1: Understanding Zener diode.
A Zener diode is a special type of diode designed to operate in the reverse breakdown region.
Step 2: Working principle.
When reverse voltage reaches the Zener breakdown voltage, the diode maintains a constant voltage across it.
Step 3: Application in regulation.

• Used in voltage regulator circuits
• Maintains steady output voltage
• Protects circuits from voltage fluctuations

Step 4: Eliminating other options.

• LED: Emits light
• Photodiode: Detects light
• Transistor: Used for amplification/switching

Step 5: Conclusion.
Thus, the Zener diode is primarily used as a voltage regulator.