The number of terminals in `n-p-n` transistor is

Options

A. 2
B. 3
C. 4
D. 5

Answer

To determine the number of terminals in an NPN transistor, we can follow these steps:

1. **Understand the Structure of the NPN Transistor**: An NPN transistor consists of three layers of semiconductor material. The layers are arranged in the order of N-type, P-type, and N-type.

2. **Identify the Terminals**: The three layers correspond to three terminals:
- **Emitter (E)**: This terminal is connected to the N-type material on one side.
- **Base (B)**: This terminal is connected to the P-type material in the middle.
- **Collector (C)**: This terminal is connected to the other N-type material on the opposite side.

3. **Count the Terminals**: By identifying the three terminals (Emitter, Base, and Collector), we can conclude that there are a total of three terminals in an NPN transistor.

4. **Conclusion**: Therefore, the number of terminals in an NPN transistor is 3.