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coil (plural coils) Something wound in the form of a helix or spiral. the sinuous coils of a snake. Washington Irving The wild grapevines that twisted their coils from tree to tree. Any intrauterine device (Abbreviation: IUD)âthe first IUDs were coil-shaped.
A transformer is a device with two or more magnetically coupled windings (or sections of a single winding). A time varying current in one coil (called the primary winding) generates a magnetic field which induces a voltage in the other coil (called the secondary winding). Degaussing coil-a coil used to demagnetize parts. 2  Voice coil-a coil used in a moving-coil loudspeaker, suspended between the poles of a magnet. 3  When the audio signal is passed through the coil, it vibrates, moving the attached speaker cone to create sound waves.