HOLT Electricians Practice Exam

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The nominal battery voltage for a lead acid cell is how many volts?

1.2 volts
2.0 volts
2.1 volts
12 volts

The correct answer is: 2.1 volts

The nominal battery voltage for a lead-acid cell is 2.1 volts. This value represents the average voltage that a fully charged lead-acid cell can provide under standard conditions. Lead-acid batteries are made up of multiple cells connected in series, and each cell contributes approximately 2.1 volts. Therefore, when you have a typical 12-volt lead-acid battery, it consists of six cells connected in series (6 cells x 2.1 volts = 12.6 volts when fully charged). Cells may display voltages slightly above or below this nominal value during operation due to factors such as state of charge, temperature, and specific design variations. However, the 2.1 volts is widely accepted as the standard reference for each cell in a lead-acid battery system.