Which device converts AC to DC?

The device that converts alternating current (AC) to direct current (DC) is known as a rectifier. Rectifiers function by allowing current to flow through them in one direction only, thus converting the bidirectional flow of AC into a unidirectional flow of DC. This is achieved using components such as diodes, which allow current to pass through when they are forward-biased and block it when they are reverse-biased.

Understanding the function of a rectifier is essential, especially in applications where DC is needed, such as in power supplies for electronic devices, battery charging, and various circuit applications where stable voltage is required.

Transformers, while related, serve a different purpose. They are used to change the voltage level of AC without converting it to DC. Inverters, on the other hand, perform the opposite function; they convert DC back into AC. Switches are devices used to open or close a circuit but do not perform any conversion of current types.