Coast Guard Exams
Question 441Electricity/Electronics - Assistant Engineer70% to pass

In the illustration, 1, 2, 3 and 4 are 12 volt batteries. What will be the nominal voltage as read by a voltmeter across the output of the battery bank? Illustration EL-0107

Diagram for question 441
AI Explanation
The correct answer is C) 24 volts. In the illustration EL-0107, the four 12 volt batteries are connected in series. When batteries are connected in series, their voltages add up. Since there are 4 batteries, each rated at 12 volts, the total nominal voltage across the battery bank will be 4 x 12 = 24 volts. The other options are incorrect because: A) 6 volts is too low, as it would only be the voltage of a single 12V battery. B) 12 volts is too low, as it would only be the voltage of a single 12V battery. D) 48 volts is too high, as it would be 4 times the voltage of a single 12V battery.