What device is used to change alternating current to direct current?

The device used to change alternating current (AC) to direct current (DC) is known as a rectifier. A rectifier functions by allowing current to flow in only one direction, effectively converting AC, which periodically reverses direction, into DC, which flows in a single direction. This conversion is crucial in various applications, particularly where direct current is needed for electronic devices, batteries, and many other applications.

In contrast, an inverter is used to convert direct current to alternating current. It serves a different purpose and is vital in systems where DC sources, such as batteries, are required to power AC devices.

A converter can refer to any device that changes one form of electrical energy to another, encompassing both rectifiers and inverters. Therefore, it is a broader term and does not specifically denote the rectifying function.

A transformer, on the other hand, is used to change the voltage level of alternating current through electromagnetic induction but does not convert AC to DC—its function is strictly related to AC voltage management.

Understanding the specific role of a rectifier is essential for those studying electrical systems, particularly in the esthetics field, as it relates to the use of various electrical devices and equipment in beauty treatments.