What device is used to convert AC to DC?

• A. Transformer.
• B. Rectifier.
• C. Inverter.
• D. Capacitor.

Answer: (B)

A rectifier is the device specifically designed to convert alternating current (AC) to direct current (DC). This conversion is fundamental in various electronic applications, as many electronic devices and circuits require DC for proper functionality.

The rectification process typically involves components such as diodes, which allow current to flow in one direction, effectively blocking the negative half-cycles of AC and allowing only the positive cycles to pass through. This results in a pulsating DC output, which can be further smoothed using filters to provide a more stable and consistent DC voltage.

Understanding the role of a rectifier is essential in many electrical systems, especially in power supplies, where AC from the mains needs to be converted into usable DC voltage for devices such as computers and mobile phones.