Input resistance of transistor in comparision to output resistance is-

Options

A. Low
B. High
C. Low and high
D. None of these

Answer

To solve the question about the input resistance of a transistor in comparison to its output resistance, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Configuration**:
- The question refers to a transistor, specifically in a common emitter configuration. In this configuration, the emitter terminal is common to both the input and output circuits.

2. **Identify Input and Output**:
- In the common emitter configuration:
- The **input** is applied between the base and emitter.
- The **output** is taken between the collector and emitter.

3. **Current Relationships**:
- In a transistor, particularly in the common emitter configuration, the base current (IB) is a small fraction of the emitter current (IE). This means that the input current is significantly smaller than the output current.

4. **Resistance Definitions**:
- **Input Resistance (Rin)**: This is the resistance seen by the input signal at the base-emitter junction.
- **Output Resistance (Rout)**: This is the resistance seen by the load connected to the collector-emitter junction.

5. **Comparison of Resistances**:
- In general, for a common emitter transistor:
- The input resistance (Rin) is typically much higher than the output resistance (Rout). This is due to the transistor's ability to amplify the input signal while maintaining a relatively low output current.

6. **Conclusion**:
- Therefore, we conclude that the input resistance of a transistor is greater than its output resistance.

### Final Answer:
The input resistance of a transistor in comparison to the output resistance is **greater**.

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