After the invention of the induction motor, alternating current (AC) machines largely replaced DC machines in ... which are formed by passing direct current through the field windings. It's this ...

Launching things with electromagnetism is pretty fun, with linear induction motors being a popular design ... they use magnetic attraction and repulsion to create a linear motion on the propulsive ...

Those are motors that run on high voltage, and the attraction and repulsion of charge ... from the earliest ion propelled ones to the induction motors which most have never heard of before ...