- noun a transformer that produces an intermittent high-voltage current from a low-voltage source by means of several wire windings generally around a soft iron core
- A transformer which changes a DC into a high voltage AC. Its primary winding is connected to a DC source which is periodically interrupted, and has comparatively few turns of a thicker wire. This primary winding induces a high voltage in its secondary winding, which is concentrically wound over the primary, and has many turns of a finer wire. An example is a Ruhmkorff induction coil.