Cells and Batteries by b5TyfV

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									Cells and Batteries


       A cell is a unit which includes
       two electrodes and one
       electrolyte.
   In your fruit battery the electrodes were
    the metal strips and the electrolyte was
    the juice in the fruit.
   When two or more cells are connected
    together, the combination is called a cell.
   Dry cells are
    connected in series
    to obtain a larger
    amount of energy and
    a higher electric
    potential (voltage).
   Batteries are made of
    a serious of cells. A 9
    volt, has 6 cells that
    produced 1.5V each
    (1.5V x 6 cells = 9V).
   When dry cells are
    connected in series,
    the electric potential
    (voltage) increases by
    1.5V each time a new
    cell is added to the
    set of dry cells.
   The amount of
    energy in the battery
    increases each time
    a new dry cell is
    added.
Electrochemical Cells
      Primary               Secondary
- Single use            - Multiple use



- Can be discharged but - Can be discharged and
not recharged           recharged

- Only one chemical     - 2 chemical processes;
reaction                one to discharge, one to
                        recharge
List advantages and disadvantages of each


           Primary                         Secondary
  Advantage:                         Advantage:

  - Has only one chemical reaction   - Can be used multiple times


  Disadvantage:                      Disadvantage:

  - Can only be used once            - Has 2 chemical processes

								
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