4.2.4 Mercury Cell
This cell is also m common use
and consists of:
an outer
steel Container as the positive electrode,
a cylinder
of compressed zinc powder in the centre of the cell as the negative electrode
potassium hydroxide
as the electrolyte surrounding the zinc plate, and
manganese
dioxide and carbon as the depolarizing mixture.
The cell is constructed so small
that it is commonly used in watches, hearing aids, and miniature calculators.
Its voltage is 1.35 V.
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| Mercury cell |
The most important features of
the mercury cell are:
It can be
stored for long periods without losing its charge through local action.
It has a
very high energy output for its size
Its drawbacks are:
It is toxic
due to high mercury content
It is
expensive
This cell has been replaced with
a safer silver oxide cell.
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