Discussion
Which of the following is the most commonly used cell in miniature electronic equipment like digital watches?
Answer: D
The mercury cell is a small button cell with a very steady voltage and a long life for its size, so it was the cell most commonly used in miniature equipment such as digital watches, hearing aids and calculators, as the key gives. A voltaic cell is a simple cell of little practical use, and the Leclanche cell is a bulky dry or wet cell used in torches and bells, and the alkaline cell is larger and in the key's view not the one for watches. The answer is Mercury cell, option (D).
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