*Question E7G01:
What is the typical output impedance of an op-amp?*  

*Correct Answer is  A: Very low*  

### AI Response: (may contain errors)  

In the context of operational amplifiers (op-amps), the output impedance is an important characteristic that affects how the op-amp interacts with the load it is driving.

### Explanation:

1. **Correct Answer: Very low**

   - **Why it's correct:**  
     Op-amps are designed to have a very low output impedance. This allows them to drive loads effectively without significant voltage drop across the output. A low output impedance ensures that the op-amp can deliver more current to the load, maintaining the desired output voltage even when the load changes.

2. **Why the other choices are incorrect:**

   - **Choice A: Very low**  
     This is the correct choice, as explained above.

   - **Choice B: Very high**  
     A very high output impedance would mean that the op-amp cannot drive loads effectively, as it would cause a significant voltage drop across the output when current flows. This is not typical for op-amps.

   - **Choice C: 100 ohms**  
     While 100 ohms is relatively low, it is not typical for op-amps, which usually have output impedances much lower than this, often in the range of a few ohms or even less.

   - **Choice D: 10,000 ohms**  
     An output impedance of 10,000 ohms is very high and would severely limit the op-amp's ability to drive loads, making it unsuitable for most applications.

### Useful Rule of Thumb:

- **Op-amp Output Impedance:**  
  Op-amps are designed to have an output impedance that is as low as possible, often less than 1 ohm, to ensure efficient power transfer to the load and minimal signal distortion.

Understanding the typical characteristics of op-amps, such as low output impedance, is crucial for designing circuits that perform well in real-world applications.