primary coil
Technical term in electrical engineering; refers to the coil in a transformer or induction device that receives the input current.
Apply an AC voltage to the primary coil of the transformer.
The secondary coil, which receives induced current from the primary coil.
General term for a coil; 一次線輪 is specifically the primary coil in a transformer or similar device.
Compound of 一次 (primary, first-order) and 線輪 (coil). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning.