character: Nikola Tesla
topic: Alternating Current and its Role in Telecommunications
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: Guglielmo Marconi
topic: Early Development of Radio Communications
grade: 9
subject: Physics
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character: James Clerk Maxwell
topic: Theory of Electromagnetism and Communication Technology
grade: 9
subject: Physics
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