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Evolution of Portable Power Sources: A Historical Perspective

Discover the fascinating journey of portable power from Luigi Galvani's frog muscle experiment to Alessandro Volta's electrochemical cells. Learn about wet and dry cells, primary vs. secondary cells, rechargeable batteries, and fuel cells. Explore various types of cells, such as zinc-carbon, alkaline, nickel-cadmium, and lead-acid.

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Evolution of Portable Power Sources: A Historical Perspective

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Presentation Transcript

  1. Topic 5 Portable Power

  2. History • Luigi Gavlnani (1737 – 1798) - noticed that a frog's muscle twitched when touched by two different metals

  3. Alessandro Volta (1745 – 1827) • Showed that voltage could be generated without using living tissues by touching different metals in a solution containing salt of acid. • Electrochemical Cell

  4. Electrochemical Cells • 2 metal ELECTRODES(the conductor) are surrounded by an ELECTROLYTE (the substance that conducts) • A battery is an EXAMPLE of a cell

  5. Wet Cell vs Dry Cell

  6. Wet Cell: • Use a liquid electrolyte(usually an acid) • Contains two electrodes (zinc and copper) Copper – positive(cathode) Zinc – negative(anode)

  7. Dry Cell: • Uses a paste as its electrolyte • Contains 2 different electrodes that become the negative and positive end of the cell

  8. Primary vs Secondary Cell Primary Cell: The reaction will not continue after the reactant have been used up Secondary Cell: Uses Chemical reactions, which can be reversed. Rechargeable Batteries

  9. Fuel Cells: • Combine Hydrogen and oxygen without combustion • They produce Electricity, Heat and Water. • Very efficient

  10. Types of Cells: Primary Dry Cells: • Zinc-Carbon • Alkaline • Zinc-Air Secondary Dry Cells: • Nickel-Cadmium • Nickel-metal hydride Secondary Wet Cell: • Lead acid

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