What is the device used for converting AC to DC called? The device used for converting alternating current (AC) to direct current (DC) is called a rectifier. A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, into direct current (DC), which flows in only one direction. The process is known as rectification. Rectifiers have many uses in a variety of electrical appliances, electronics and technology sectors. Their most notable use is in power supplies where they convert the AC voltage into a steady DC voltage. They are also commonly used in electronic devices such as radios and televisions to detect the audio and video signals from radio and television broadcasts. Rectifiers are fundamentally crucial for several gadgets, devices and appliances that rely on DC for their operations. Since most households, offices, industries, etc., receive AC power supply, it becomes necessary to convert the same into DC for thes...