*Question G7A09:
Which symbol in figure G7-1 represents a field effect transistor?*  

*Correct Answer is  C: Symbol 1*  

### AI Response: (may contain errors)  

In the context of the Extra Class exam, understanding electronic symbols is crucial. 

1. **Correct Answer: Symbol 1**  
   - Symbol 1 represents a field effect transistor (FET). FETs are commonly used in various electronic circuits due to their high input impedance and low power consumption. The symbol typically consists of three terminals: the source, gate, and drain, which are characteristic of FETs.

2. **Why the Other Choices are Incorrect:**
   - **Symbol 2:** This symbol usually represents a bipolar junction transistor (BJT), which has a different structure and operation compared to FETs.
   - **Symbol 4:** This symbol often represents a diode, which allows current to flow in one direction only, unlike a FET that can control current flow based on voltage at the gate.
   - **Symbol 5:** This symbol typically represents a resistor, which is a passive component that opposes current flow, not an active device like a FET.

3. **Useful Rules of Thumb:**
   - Remember that FETs are voltage-controlled devices, while BJTs are current-controlled. This distinction can help you identify the correct symbols in diagrams.
   - Familiarize yourself with common electronic symbols, as they are frequently used in circuit diagrams and exam questions.

By understanding these distinctions, you can confidently identify FETs and other components in exam scenarios.