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Hertz, showing the difference between science and engineering (lemmy.world)
submitted 1 year ago by to c/science_memes@mander.xyz
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[–] 1 point 1 year ago (2 children)

There were electrochemical cells (invented in 1800) that provided a constant current for some time.

Idk the details. Look up Galvanic cell, Volta cell.

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