character: George Westinghouse
topic: Development of Electric Power Systems
grade: 9
subject: Physics
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character: Thomas Edison
topic: Direct Current vs. Alternating Current
grade: 9
subject: Physics
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character: Nikola Tesla
topic: Alternating Current Innovations
grade: 9
subject: Physics
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character: William Stanley
topic: Transformers in Electric Power Distribution
grade: 9
subject: Physics
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