An AC generator, also known as an alternator, is a device that converts mechanical energy into electrical energy in the form of alternating current (AC). It works on the principle of electromagnetic induction, where a conductor, such as a coil of wire, moves through a magnetic field, generating electricity. AC generators are commonly used in power plants and various applications, including automobiles and portable generators. They are essential for providing electricity to homes and businesses, as AC is the standard form of electricity used in most electrical systems worldwide.