*Question T7C07:
What happens to power lost in a feed line?*  

*Correct Answer is  C: It is converted into heat*  

### AI Response: (may contain errors)  

When power is lost in a feed line, it is primarily converted into heat. Let's break down the correct answer and the other choices:

### Correct Answer: C - It is converted into heat
- **Explanation**: 
  - When RF power travels through a feed line, some of it is absorbed by the resistance of the wire, which results in energy loss. This lost power is dissipated as heat due to the resistive properties of the conductor. This phenomenon is described by Joule's law, which states that the power loss ($P_{loss}$) in a resistor is given by:
  
  $$
  P_{loss} = I^2 R
  $$
  
  where:
  - $I$ = current through the conductor
  - $R$ = resistance of the conductor

### Why the Other Choices are Incorrect:
- **A: It increases the SWR**
  - **Explanation**: Standing Wave Ratio (SWR) is a measure of impedance matching between the feed line and the antenna. While poor matching can lead to higher SWR, power loss in the feed line itself does not directly increase SWR. Instead, it can be a result of high SWR.

- **B: It is radiated as harmonics**
  - **Explanation**: Harmonics are generated when a non-linear device distorts the signal, not from power loss in the feed line. The power lost in the feed line does not contribute to harmonic radiation; it simply dissipates as heat.

- **D: It distorts the signal**
  - **Explanation**: While power loss can affect the overall signal strength, it does not inherently distort the signal. Distortion typically arises from non-linearities in the system, not from resistive losses in the feed line.

### Summary
- Power lost in a feed line is primarily converted into heat due to resistive losses.
- Understanding these concepts is crucial for optimizing antenna systems and ensuring efficient power transfer.