Zener diode is used as

Options

A. Rectification
B. Stabilisation
C. Amplification
D. producing oscillations in an oscillator

Answer

### Step-by-Step Solution:

1. **Understanding the Zener Diode**:
- A Zener diode is a type of diode that allows current to flow in the reverse direction when a specific reverse voltage (known as the Zener breakdown voltage) is reached.

2. **Reverse Bias Operation**:
- The Zener diode operates in reverse bias, meaning that the positive terminal of the voltage source is connected to the cathode and the negative terminal to the anode.

3. **Breakdown Region**:
- When the reverse voltage applied across the Zener diode exceeds a certain threshold (the Zener voltage), the diode enters the breakdown region. In this region, it can conduct current while maintaining a constant voltage across its terminals.

4. **Constant Current**:
- As the reverse voltage increases beyond the Zener voltage, the current through the diode remains constant (known as the saturation current) despite further increases in voltage. This characteristic is crucial for voltage regulation.

5. **Applications of Zener Diode**:
- **Voltage Regulation**: The Zener diode is widely used to provide a stable reference voltage in circuits.
- **Surge Suppression**: It can protect circuits from voltage spikes by clamping the voltage to a safe level.
- **Reference Element**: It serves as a reference voltage in various electronic applications.
- **Switching Applications**: It is used in switching circuits to control voltage levels.
- **Clipper Circuits**: Zener diodes are used in clipper circuits to limit the voltage to a certain level.

6. **Conclusion**:
- Based on the above points, the Zener diode is primarily used for voltage stabilization and regulation in electronic circuits.

### Final Answer:
Zener diode is used as a voltage regulator and for circuit stabilization.

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