character: George Westinghouse
topic: Promoted the Adoption of AC Power Systems
grade: 4
subject: Social Studies
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character: Thomas Edison
topic: Direct Current (DC) Electric Systems
grade: 4
subject: Social Studies
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character: Nikola Tesla
topic: Alternating Current (AC) Innovations
grade: 4
subject: Social Studies
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character: Frank J. Sprague
topic: AC Motor Development
grade: 4
subject: Social Studies
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