*Question G6A03:
What is the approximate forward threshold voltage of a germanium diode?*  

*Correct Answer is  B: 0.3 volts*  

### AI Response: (may contain errors)  

The forward threshold voltage of a diode is the minimum voltage required for the diode to conduct current in the forward direction. Different types of diodes have different threshold voltages.

1. **Correct Answer: 0.3 volts (Choice B)**
   - Germanium diodes typically have a forward threshold voltage of approximately 0.3 volts. This is due to the material properties of germanium, which allow it to conduct at a lower voltage compared to silicon.

2. **Why the Other Choices are Incorrect:**
   - **Choice A: 0.1 volt**  
     - This voltage is too low for a germanium diode. While some specialized diodes might have very low threshold voltages, standard germanium diodes are around 0.3 volts.
   - **Choice C: 0.7 volts**  
     - This is the typical forward threshold voltage for silicon diodes, not germanium. Silicon diodes require more voltage to start conducting.
   - **Choice D: 1.0 volts**  
     - This voltage is too high for both germanium and silicon diodes. It is not representative of the forward threshold voltage for standard diodes.

3. **Useful Rule of Thumb:**
   - **Germanium Diodes:** ~0.3 volts
   - **Silicon Diodes:** ~0.7 volts

Understanding these typical values helps in identifying the type of diode and its expected behavior in circuits.