What is the open-circuit voltage of a lead-acid cell?

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Multiple Choice

What is the open-circuit voltage of a lead-acid cell?

Explanation:
Open-circuit voltage is the voltage a lead-acid cell produces when no current is flowing; it reflects the cell’s electromotive force at rest. For a healthy, fully charged lead-acid cell, this resting voltage is about 2.1 volts. That’s why 2.1 volts is the correct value. A rough nominal of around 2.0 V exists, but open-circuit voltage is typically a bit higher, near 2.1 V. A reading near 2.2 V would be unusual for a resting cell, and 1.8 V indicates a discharged condition. In a 12-volt battery, six cells in series give about 12.6 V when fully charged (6 × 2.1 V).

Open-circuit voltage is the voltage a lead-acid cell produces when no current is flowing; it reflects the cell’s electromotive force at rest. For a healthy, fully charged lead-acid cell, this resting voltage is about 2.1 volts. That’s why 2.1 volts is the correct value. A rough nominal of around 2.0 V exists, but open-circuit voltage is typically a bit higher, near 2.1 V. A reading near 2.2 V would be unusual for a resting cell, and 1.8 V indicates a discharged condition. In a 12-volt battery, six cells in series give about 12.6 V when fully charged (6 × 2.1 V).

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