*Question G7A07:
What is the output waveform of an unfiltered full-wave rectifier connected to a resistive load?*  

*Correct Answer is  A: A series of DC pulses at twice the frequency of the AC input*  

### AI Response: (may contain errors)  

To understand the output waveform of an unfiltered full-wave rectifier connected to a resistive load, let's break down the operation of the rectifier and analyze the choices.

### Correct Answer: 
**A: A series of DC pulses at twice the frequency of the AC input**

#### Explanation:
- A full-wave rectifier takes both halves of the AC waveform and converts them into positive voltage. 
- If the input AC signal has a frequency of $f$, the output will have a frequency of $2f$ because it rectifies both the positive and negative halves of the waveform.
- This results in a series of pulses that occur twice as often as the input frequency, hence the output is a series of DC pulses at twice the frequency of the AC input.

### Why the Other Choices are Incorrect:

- **B: A series of DC pulses at the same frequency as the AC input**
  - This is incorrect because a full-wave rectifier does not simply pass the AC frequency through; it doubles the frequency by rectifying both halves of the waveform.

- **C: A sine wave at half the frequency of the AC input**
  - This is incorrect because a full-wave rectifier does not produce a sine wave. Instead, it produces a pulsating DC waveform, which is not a sine wave and certainly not at half the frequency.

- **D: A steady DC voltage**
  - This is incorrect because the output of an unfiltered full-wave rectifier is not steady; it consists of pulsating DC. A steady DC voltage would require additional filtering to smooth out the pulsations.

### Summary:
- The output of an unfiltered full-wave rectifier is a series of DC pulses at twice the frequency of the AC input due to the rectification of both halves of the waveform.
- Understanding the operation of rectifiers is crucial for predicting their output characteristics in various applications.