*Question G4B01:
What item of test equipment contains horizontal and vertical channel amplifiers?*  

*Correct Answer is  D: An oscilloscope*  

### AI Response: (may contain errors)  

The correct answer is **D: An oscilloscope**.

### Explanation of the Correct Answer:
- An oscilloscope is a device used to visualize electrical signals. It has horizontal and vertical channel amplifiers that allow it to display waveforms on a screen. 
  - The **horizontal amplifier** controls the time base, allowing you to see how the signal changes over time.
  - The **vertical amplifier** controls the amplitude of the signal, allowing you to see the voltage levels.

### Why the Other Choices are Incorrect:
- **A: An ohmmeter**
  - An ohmmeter is used to measure resistance in ohms. It does not have horizontal and vertical amplifiers; it simply provides a reading of resistance.

- **B: A signal generator**
  - A signal generator produces electrical signals of varying frequencies and amplitudes. While it can create waveforms, it does not have the capability to display them like an oscilloscope does.

- **C: An ammeter**
  - An ammeter measures current in amperes. It is designed to measure the flow of electric current and does not include horizontal and vertical amplifiers for waveform visualization.

### Summary:
- An oscilloscope is the only device among the choices that contains both horizontal and vertical channel amplifiers, making it essential for analyzing and visualizing electrical signals.