character: Nikola Tesla
topic: Alternating Current System
grade: 9
subject: Science
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character: Thomas Edison
topic: Direct Current vs. Alternating Current
grade: 9
subject: Science
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character: Michael Faraday
topic: Electromagnetic Induction
grade: 9
subject: Science
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character: George Westinghouse
topic: Commercialization of AC Power
grade: 9
subject: Science
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