The device that converts chemical energy into electrical energy is called a battery. It consists of one or more electrochemical cells that generate electrical energy through chemical reactions, typically involving two different materials (anode and cathode) immersed in an electrolyte. As the chemical reactions occur, electrons flow from one terminal to the other, creating an electric current. Batteries are widely used in various applications, from powering small devices like remote controls to larger systems like electric vehicles, highlighting their importance in modern technology.