The device that converts AC (Alternating Current) to DC (Direct Current) is called a **rectifier**.
A rectifier allows current to flow in only one direction, which turns the AC, where the direction of current keeps changing, into DC, where the current flows in one steady direction. There are different types of rectifiers:
1. **Half-Wave Rectifier**: It only uses one half of the AC wave, blocking the other half. This results in a pulsating DC output.
2. **Full-Wave Rectifier**: It uses both halves of the AC wave, providing a smoother and more continuous DC output compared to a half-wave rectifier.
3. **Bridge Rectifier**: A more advanced form of full-wave rectification using four diodes arranged in a bridge. It also provides smooth DC output.
In these systems, **diodes** are the main components that allow current to flow only in one direction, ensuring the conversion from AC to DC.