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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.
The coil is a compact, electrical transformer that boosts the batteryâs 12 volts to as high as 40,000 volts. To understand how ignition coils operate requires that you understand some basic principles of electronics.