Question: Who developed the first alternating current electric system?
Disambiguated questions and answers: question: Who developed the first alternating current alternator?
Who developed the first practical application of alternating current?
Who developed the first alternating current electric arc lighting system?
Who developed the first induction motor that was an alternating current power system?
answer: Hippolyte Pixii
Guillaume Duchenne,
Pavel Yablochko
Nikola Tesla
Natural Questions answer: Nikola Tesla (from the Wikipedia article "Alternating current")