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A lead acid car battery is built from cells that each produce 2 V. How many cells give the usual 12 V?
ASix cells
BFour cells
CEight cells
DTwelve cells
Answer & Solution
Correct answer: A. Six cells
1. Cells wired in series add their voltages together.
2. Each lead acid cell supplies 2 volts.
3. Reaching 12 volts needs 12 divided by 2, which is 6 cells.
4. Twelve cells would give 24 volts, double what a car battery supplies.
_Source: OpenStax Chemistry (CC BY 4.0), Chs 7 and 17, section 17.5 Batteries and Fuel Cells_
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