特斯拉离开爱迪生公司后,成立自己的公司发展交流电发电机与马达,并受邀在美国电机协会(American Institute of Electrical Engineers,现今的IEEE前身)展示他的发明。这个消息很快的传到西屋公司的老板乔治西屋的耳中。他检视特斯拉的发明及交流电相关专利后,决定以6万美金买下特斯拉专利的使用权,再加上一笔丰厚的权利金,还聘请特斯拉当西屋公司的顾问,与技术团队共同研发交流电系统。
爱迪生与西屋两派人马选择不同的供电技术,在19世纪末的美国引发后世所谓的“电流大战”(The War of Current)。以现代的眼光看来,或许会认为,这有什么好争的?交流电可以传输得比较远又有弹性,既符合经济效益又能满足不同电压需求,当然应该选择交流电系统!然而,在当时“电学”还处于萌芽阶段,爱迪生与19世纪末其他科学家,对于这个新兴的能量模式的许多地方尚未充分了解,自然无法像现代人习惯“电”就像习惯空气一样,因此他们对交流电有误解甚至错判形势,并不算是重大失误。
“As soon as it is completed, it will be possible for a business man in New York to dictate instructions, and have them instantly appear in type at his office in London or elsewhere. He will be able to call up, from his desk, and talk to any telephone subscriber on the globe, without any change whatever in the existing equipment. An inexpensive instrument, not bigger than a watch, will enable its bearer to hear anywhere, on sea or land, music or song, the speech of a political leader, the address of an eminent man of science, or the sermon of an eloquent clergyman, delivered in some other place, however distant. In the same manner any picture, character, drawing, or print can be transferred from one to another place .”
发展法国第一个雷达系统的工程师Émile_Girardeau曾说:人们戏称特斯拉为预言家或梦想家,因为他手上没有足够工具实现他的梦想。但不要忘记,就算特斯拉是在作梦,至少他作的是正确的梦。(" (Tesla) was prophesying or dreaming, since he had at his disposal no means of carrying them out, but one must add that if he was dreaming, at least he was dreaming correctly.")