Chapter 4  image

AC Electricity

“I have just seen the drawings and descriptions of an electrical machine lately patented by a Mr. Tesla, and sold to the Westinghouse Company, which will revolutionize the whole electric business in the world. It is the most valuable patent since the telephone.”

Mark Twain, November 1888*

Alternating current is made possible by the principle of rotating magnetic fields. In fact, without magnetism, there would be no electricity at all. In order to fully understand how AC electricity is generated, distributed, and used, we must first understand its underlying principles, starting with magnetism.


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