Which of the following is an example of equipment that uses mercury cells?
Calculators
A mercury cell is a small button-type primary cell that delivers a very steady, almost constant voltage from a compact package, which makes it well suited to small, low-power portable electronics.
The key selection factors are size and current draw: mercury cells are physically tiny and supply only small currents over long periods, so they fit devices that sip power.
A pocket calculator is exactly this kind of low-drain, portable device, so it commonly used a mercury button cell to run for a long time from a small cell.
Kitchen ovens are high-power heating appliances that run on the AC mains and cannot be supplied by a tiny button cell.
Televisions likewise draw their operating power from the mains supply, not from mercury cells.
Ceiling fans are mains-driven motors requiring far more current than a button cell can provide, so they too are ruled out.
Hence, the answer is Calculators.
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In dry cells, free electrons are released at:
The most common used primary cell is :
