No single person “discovered” lightning, but Benjamin Franklin is most famously credited with demonstrating that lightning is a form of electricity in 1752.

Quick Scoop

  • Lightning is a natural phenomenon that humans have observed since prehistory, so it was never “discovered” in the way a new planet or element is.
  • In the mid‑1700s, Benjamin Franklin proposed that lightning was electrical and tested this with his famous kite experiment during a storm in Philadelphia.
  • That experiment showed sparks could be drawn from storm clouds, confirming that lightning is an electrical discharge and inspiring the invention of the lightning rod.

Franklin and the idea

  • By 1749, Franklin was already writing about similarities between man‑made electrical sparks and lightning, such as their brightness, jagged path, and crackling sound.
  • In 1752, he used a kite, a wet string, and a metal key to draw charge from a storm cloud, proving the connection between electricity and lightning without being directly struck.

Was he really the first?

  • Other scientists in Europe also suspected lightning was electrical, and the French experimenter Thomas‑François Dalibard performed a similar test with a tall metal rod shortly before Franklin’s kite experiment.
  • Because Franklin’s ideas inspired those tests and his dramatic story spread widely, he is the one most schoolbooks credit when people ask “who discovered lightning.”

TL;DR: People have always known lightning exists, but Benjamin Franklin is widely credited with discovering that lightning is actually electricity, thanks to his 1752 kite experiment and related work.

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