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A large D cell and a small AAA cell are both zinc carbon dry cells. How do they compare?
ASame voltage, but the D cell gives fewer electrons
BHigher voltage from the D cell and more electrons
CSame voltage, but the D cell gives more electrons
DLower voltage from the D cell and more electrons
Answer & Solution
Correct answer: C. Same voltage, but the D cell gives more electrons
1. Voltage is set by the chemistry of the half-reactions, not by how much material is present.
2. Both cells use the same zinc carbon chemistry, so both give the same voltage.
3. The larger cell simply holds more reactant.
4. More reactant means more moles of electrons can be delivered before the cell is flat.
5. So the D cell lasts longer at the same voltage rather than pushing harder.
_Source: OpenStax Chemistry (CC BY 4.0), Chs 7 and 17, section 17.5 Batteries and Fuel Cells_
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