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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 that changes (transforms) and alternating potential difference (voltage) from one value to another value be it smaller or greater using the principle of electromagnetic induction. A transformer consists of a soft iron coil with two coils wound around it which are not connected to one another. These coils can be wound either on separate limbs of the iron core or be arranged on top of each other. The coil to which the alternating voltage is supplied is called the primary coil or primary winding.