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 operates 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, vehicles, and various industrial applications. They can produce electricity at different voltages and frequencies, making them versatile for different uses. The generated AC can be easily transformed and transmitted over long distances, making it a key component of modern electrical systems.