*Question T6B02:
What electronic component allows current to flow in only one direction?*  

*Correct Answer is  C: Diode*  

### AI Response: (may contain errors)  

The correct answer to the question is **C: Diode**.

### Explanation of the Correct Answer:
- A **diode** is a semiconductor device that allows current to flow in only one direction. This property is essential in various applications, such as rectification, where alternating current (AC) is converted to direct current (DC). The diode has a forward bias (allowing current flow) and a reverse bias (blocking current flow).

### Why the Other Choices are Incorrect:
- **A: Resistor**  
  - A resistor is a passive component that opposes the flow of current, but it does not control the direction of current flow. It allows current to flow in both directions equally.

- **B: Fuse**  
  - A fuse is a safety device that protects circuits by breaking the connection when the current exceeds a certain level. It does not control the direction of current flow; it simply interrupts it when necessary.

- **D: Driven element**  
  - A driven element is a part of an antenna system that is directly connected to the transmitter. It does not have any properties related to controlling the direction of current flow.

### Useful Rules of Thumb:
- Diodes are often used in power supply circuits to convert AC to DC.
- The forward voltage drop of a silicon diode is typically around 0.7 volts, while a germanium diode has a lower forward voltage drop of about 0.3 volts.

Understanding the function of a diode is crucial for various electronic applications, especially in radio and communication systems.