Tesla coil

A Tesla coil is a type of resonant transformer, named after its inventor, Serbian scientist Nikola Tesla. The Tesla coil designs can also be used to create long electrical discharges.

In 2368 the pulse of energy ripped through Ro Laren body like sparks through a Tesla coil until it reached her brain and exploded with white-hot intensity. Ro crumpled to the ground in a senseless heap. (TNG novel: War Drums)