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Topic 5 Portable Power

Topic 5 Portable Power. History. Luigi Gavlnani (1737 – 1798) - noticed that a frog's muscle twitched when touched by two different metals. Alessandro Volta (1745 – 1827).

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Topic 5 Portable Power

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  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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