Actually, a magnetohydrodynamic (MHD) drive uses some electrohydrodynamics as well. Generally salt water flows though the poles of a magnet while a current is run through the salt water. The interaction of the current and the magnetic field cause a force that pushes the ions. The ions drag the water with them creating a jet and propelling the craft in the opposite direction. Get all that? No? Well you're in luck because there's a picture that explains everything, just replace the plasma with salt water.
