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

*Correct Answer is  D: An oscilloscope*  

### AI Response: (may contain errors)  

An oscilloscope is the correct answer because it is a piece of test equipment that displays electrical signals as waveforms on a screen. It uses horizontal and vertical channel amplifiers to control the display of these waveforms.

1. **Why the correct answer is correct:**
   - **Oscilloscope (D):** An oscilloscope has both horizontal and vertical channel amplifiers. The vertical amplifier processes the input signal to display its amplitude, while the horizontal amplifier controls the time base, allowing you to see how the signal changes over time.

2. **Why the other choices are incorrect:**
   - **Ohmmeter (A):** An ohmmeter measures electrical resistance and does not display waveforms or require horizontal and vertical amplifiers.
   - **Signal Generator (B):** A signal generator produces electrical signals of varying frequencies and amplitudes but does not display them as waveforms, so it does not need horizontal and vertical amplifiers.
   - **Ammeter (C):** An ammeter measures current flow in a circuit and does not display waveforms, so it does not use horizontal and vertical amplifiers.

Understanding the function of an oscilloscope and its components is crucial for interpreting and analyzing electrical signals in various applications.