Question 99Electricity & Electronics - Assistant Engineer

The correct answer is C) 1.280. The open-circuit cell voltage of 2.12 volts corresponds to a specific gravity of approximately 1.280 for a lead-acid battery under normal conditions. This relationship between open-circuit voltage and specific gravity is well-established in the regulations and guidelines for the U.S. Coast Guard Captain's License Examinations. The other answer choices are incorrect because they do not accurately reflect the specific gravity associated with a 2.12 volt open-circuit cell voltage. A specific gravity of 1.260, 1.270, or 1.290 would not be the appropriate match for the given voltage measurement.