*Question G7A03:
Which type of rectifier circuit uses two diodes and a center-tapped transformer?*  

*Correct Answer is  A: Full-wave*  

### AI Response: (may contain errors)  

In a full-wave rectifier circuit using a center-tapped transformer, two diodes are used to convert AC (alternating current) to DC (direct current). Here's why the correct answer is "Full-wave":

1. **Correct Answer: Full-wave**
   - A full-wave rectifier with a center-tapped transformer uses two diodes. Each diode conducts during one half of the AC cycle, allowing both halves of the AC waveform to be used. This results in a smoother DC output compared to a half-wave rectifier.
   - The center-tap of the transformer provides a reference point, allowing each diode to rectify one half of the AC waveform.

2. **Why the Other Choices are Incorrect:**
   - **Full-wave bridge (B):** This type of rectifier uses four diodes arranged in a bridge configuration, not two. It does not require a center-tapped transformer.
   - **Half-wave (C):** A half-wave rectifier uses only one diode and does not utilize a center-tapped transformer. It only rectifies one half of the AC waveform, resulting in a less efficient conversion.
   - **Synchronous (D):** Synchronous rectifiers use active devices like transistors instead of diodes to perform rectification. They are not defined by the number of diodes or the use of a center-tapped transformer.

3. **Useful Formulas:**
   - The output DC voltage for a full-wave rectifier with a center-tapped transformer can be approximated as:
     $$ V_{\text{DC}} = \frac{2V_{\text{peak}}}{\pi} $$
   - Where $V_{\text{peak}}$ is the peak voltage of the transformer's secondary winding.

This explanation helps you understand why a full-wave rectifier with a center-tapped transformer uses two diodes and how it differs from other rectifier types.