noun
induction coil
A device that produces high-voltage pulses from a low-voltage DC source, used in early radio transmitters, ignition systems, and educational demonstrations.
物理の実験で誘導コイルを使って火花を発生させた。
We used an induction coil to generate sparks in the physics experiment.
Compound of 誘導 (ゆうどう, 'induction') and コイル ('coil'), a straightforward technical term.