The term 'electric coil' can be summarized as a device consisting of a wire or other conductor wound into a spiral or helix shape. It is often used to convert electrical energy into magnetic energy, and vice versa. The most famous example of an electric coil is the Tesla Coil, invented by Nikola Tesla in 1891. The Tesla Coil is a high-voltage transformer that produces electrical energy in the form of sparks and lightning. It is used in many applications, including radio transmission, wireless power transfer, and medical imaging.