Table 7. Estimated pre tax cost of CR (coldrolled) coils ( tonne)

In the case of a machine with field coils, a current must flow in the coils to generate the field, otherwise no power is transferred to or from the rotor.

This was actually the experiment. So you can see the coils were somewhat larger.

An alternating current in the primary coils accelerates electrons in the vacuum around a circular path.

Today their main use is for entertainment and educational displays, although small coils are still used today as leak detectors for high vacuum systems.

Also part of the standard equipment were induction coils which, together with an interrupter circuit, were used with one of the electrochemical cells to deliver an electric shock.

What Dr. Soljacic figured out how to do was separate the coils in a transformer to a greater distance than the size of those transformers using this technology, which is not dissimilar from the way an opera singer shatters a glass on the other side of the room.