The zener diode can be used as

Options

A. An amplifier
B. An oscillator
C. Rectifier
D. Voltage stabilizer

Answer

To determine the correct use of a Zener diode, we will analyze its characteristics and applications step by step.

### Step 1: Understanding Zener Diode Operation
A Zener diode is specifically designed to operate in reverse bias. In reverse bias, the Zener diode allows current to flow when the voltage exceeds a certain threshold known as the Zener breakdown voltage.

**Hint:** Remember that Zener diodes are primarily used in reverse bias mode.

### Step 2: Analyzing the Voltage-Current Characteristics
When a Zener diode is in reverse bias, its voltage-current (V-I) characteristics show that after reaching the Zener breakdown voltage, the voltage across the diode remains nearly constant even as the current increases significantly. This property is crucial for its applications.

**Hint:** Look for the region in the V-I characteristics where the voltage remains constant despite increasing current.

### Step 3: Identifying Applications
Given the unique property of maintaining a constant voltage, Zener diodes are commonly used for voltage regulation. They can stabilize the output voltage in power supplies and protect circuits from voltage spikes.

**Hint:** Think about situations where maintaining a constant voltage is essential in electronic circuits.

### Step 4: Evaluating the Options
Now, let's evaluate the provided options:
1. **Amplifier** - Zener diodes are not used for amplification.
2. **Oscillator** - Zener diodes are not typically used in oscillators.
3. **Rectifier** - While diodes can be used for rectification, Zener diodes are not primarily used for this purpose.
4. **Voltage Stabilizer** - This is the primary application of Zener diodes.

**Hint:** Focus on the primary function of the Zener diode in maintaining voltage stability.

### Conclusion
Based on the analysis, the Zener diode can be used as a **voltage stabilizer**. Therefore, the correct answer is option 4.

**Final Answer:** The Zener diode can be used as a voltage stabilizer.