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Georg Simon Ohm determined that the current that flows through a wire is proportional to its cross sectional area and inversely proportional to its length or Ohms Law.
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Louis Latimer and fellow inventor Joseph V. Nichols received a patent for their invention of the first incandescent light bulb with carbon filament. Prior to this breakthrough, filaments had been made from paper.
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The first ligthbulb has multiple persons claiming to have created it, but we still do not know the original man that created it.