*Question T5B03:
Which is equal to one kilovolt?*  

*Correct Answer is  C: One thousand volts*  

### AI Response: (may contain errors)  

To understand the question about kilovolts, we need to know what a kilovolt (kV) is:

- **Kilovolt (kV)** is a unit of electrical potential equal to one thousand volts (V).

### Correct Answer:
- **C: One thousand volts**  
This is correct because "kilo" is a metric prefix that means one thousand. Therefore, one kilovolt is defined as:

$$
1 \text{ kV} = 1000 \text{ V}
$$

### Why the Other Choices are Incorrect:
- **A: One one-thousandth of a volt**  
This is incorrect because one one-thousandth of a volt is actually one millivolt (mV), not a kilovolt. The relationship is:

$$
1 \text{ mV} = 0.001 \text{ V}
$$

- **B: One hundred volts**  
This is incorrect because one hundred volts is simply 100 V, which is much less than one kilovolt. 

- **D: One million volts**  
This is incorrect because one million volts is equal to one megavolt (MV), not a kilovolt. The relationship is:

$$
1 \text{ MV} = 1,000,000 \text{ V}
$$

### Summary:
- **Kilovolt (kV)** = 1000 volts (V)
- **Millivolt (mV)** = 0.001 volts (V)
- **Megavolt (MV)** = 1,000,000 volts (V)

Understanding these units and their relationships is crucial for the Extra Class exam and for practical applications in amateur radio.