Of the various branches of electrical investigation, perhaps the most interesting and immediately the most promising is that dealing with alternating currents.

We wind a simple ring of iron with coils; we establish the connections to the generator, and with wonder and delight we note the effects of strange forces which we bring into play, which allow us to transform, to transmit and direct energy at will.

As in nature, all is ebb and tide, all is wave motion, so it seems that in all branches of industry, alternating currents - electric wave motion - will have the sway.

Nikola Tesla Quotes