Transistor Function

Question

A transistor can be used chiefly for?

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1. **Bipolar Junction Transistor (BJT)**: A three-terminal semiconductor device (Emitter, Base, Collector).
2. **Amplifier Mode**: Operates in the **active region** where small changes in base current ($I_b$) result in large changes in collector current ($I_c$). This process increases the signal power.
3. **Switch Mode**: Operates between **cutoff** (off) and **saturation** (on) regions. Used in digital circuits to represent binary states ($0$ and $1$).
4. **Conclusion**: These two functionalities (amplification and switching) form the foundation of modern electronics.

Transistor Function

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